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Posted to notifications@skywalking.apache.org by gi...@apache.org on 2021/02/17 01:28:19 UTC
[skywalking-website] branch asf-site updated: deploy:
1f03fd1fb8400ad9f7f64919dd7f5abcae06d478
This is an automated email from the ASF dual-hosted git repository.
github-bot pushed a commit to branch asf-site
in repository https://gitbox.apache.org/repos/asf/skywalking-website.git
The following commit(s) were added to refs/heads/asf-site by this push:
new aad1346 deploy: 1f03fd1fb8400ad9f7f64919dd7f5abcae06d478
aad1346 is described below
commit aad134655316bd62398d9ef00a7f9d55490db917
Author: wu-sheng <wu...@users.noreply.github.com>
AuthorDate: Wed Feb 17 01:28:07 2021 +0000
deploy: 1f03fd1fb8400ad9f7f64919dd7f5abcae06d478
---
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<meta property="og:type" content="article" />
<meta property="og:url" content="/blog/skywalking8-4-release/" />
<meta property="article:published_time" content="2021-02-05T00:00:00+00:00" />
-<meta property="article:modified_time" content="2021-02-10T16:49:22+08:00" />
+<meta property="article:modified_time" content="2021-02-17T09:26:52+08:00" />
<meta itemprop="name" content="Apache SkyWalking 8.4: Logs, VM Monitoring, and Dynamic Configurations at Agent Side">
<meta itemprop="description" content="Logs, VM Monitoring, and Dynamic Configurations at Agent Side">
<meta itemprop="datePublished" content="2021-02-05T00:00:00+00:00" />
-<meta itemprop="dateModified" content="2021-02-10T16:49:22+08:00" />
+<meta itemprop="dateModified" content="2021-02-17T09:26:52+08:00" />
<meta itemprop="wordCount" content="631">
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diff --git a/docs/index.html b/docs/index.html
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</button>
<div class="dropdown-menu">
- <a class="dropdown-item" target="_blank" href="https://github.com/apache/skywalking/tree/v8.4.0/docs">v8.4.0</a>
+ <a class="dropdown-item" target="_blank" href="/docs/main/v8.4.0/readme/">v8.4.0</a>
- <a class="dropdown-item" target="_blank" href="https://github.com/apache/skywalking/tree/8.3.0/docs-hotfix/docs">v8.3.0</a>
+ <a class="dropdown-item" target="_blank" href="/docs/main/v8.3.0/readme/">v8.3.0</a>
- <a class="dropdown-item" target="_blank" href="https://github.com/apache/skywalking/tree/v8.2.0/docs">v8.2.0</a>
+ <a class="dropdown-item" target="_blank" href="/docs/main/v8.2.0/readme/">v8.2.0</a>
</div>
</div>
diff --git a/docs/main/v8.2.0/en/FAQ/MQ-involved-architecture.png b/docs/main/v8.2.0/en/FAQ/MQ-involved-architecture.png
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new file mode 100644
index 0000000..276642f
--- /dev/null
+++ b/docs/main/v8.2.0/en/concepts-and-designs/backend-overview/index.html
@@ -0,0 +1,1045 @@
+<!doctype html>
+<html lang="en" class="no-js">
+ <head>
+ <meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
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+<meta name="generator" content="Hugo 0.74.3" />
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+<title>Observability Analysis Platform | Apache SkyWalking</title><meta property="og:title" content="Observability Analysis Platform" />
+<meta property="og:description" content="Observability Analysis Platform OAP(Observability Analysis Platform) is a new concept, which starts in SkyWalking 6.x. OAP replaces the old SkyWalking whole backend. The capabilities of the platform are following.
+OAP capabilities OAP accepts data from more sources, which belongs two groups: Tracing and Metrics.
+ Tracing. Including, SkyWalking native data formats. Zipkin v1,v2 data formats and Jaeger data formats. Metrics. SkyWalking integrates with Service Mesh platforms, such as Istio, Envoy, Linkerd, to provide observability from data panel or control panel." />
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+<meta itemprop="description" content="Observability Analysis Platform OAP(Observability Analysis Platform) is a new concept, which starts in SkyWalking 6.x. OAP replaces the old SkyWalking whole backend. The capabilities of the platform are following.
+OAP capabilities OAP accepts data from more sources, which belongs two groups: Tracing and Metrics.
+ Tracing. Including, SkyWalking native data formats. Zipkin v1,v2 data formats and Jaeger data formats. Metrics. SkyWalking integrates with Service Mesh platforms, such as Istio, Envoy, Linkerd, to provide observability from data panel or control panel.">
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+OAP capabilities OAP accepts data from more sources, which belongs two groups: Tracing and Metrics.
+ Tracing. Including, SkyWalking native data formats. Zipkin v1,v2 data formats and Jaeger data formats. Metrics. SkyWalking integrates with Service Mesh platforms, such as Istio, Envoy, Linkerd, to provide observability from data panel or control panel."/>
+
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+
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+ src="https://cdn.bootcdn.net/ajax/libs/jquery/3.3.1/jquery.min.js"
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+
+
+
+ <h5>Documentation: v8.2.0</h5>
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/readme">Welcome</a>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/concepts-and-designs/readme">Concepts and Designs</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div >What is SkyWalking?</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/overview">Overview and Core concepts</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/project-goals">Project Goals</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Probe</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/probe-introduction">Introduction</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/service-agent">Service auto instrument agent</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/manual-sdk">Manual instrument SDK</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/service-mesh-probe">Service Mesh probe</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Backend</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/backend-overview">Overview</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/oal">Observability Analysis Language</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/protocols/readme#query-protocol">Query in OAP</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >UI</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/ui-overview">Overview</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/readme">Setup</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div >Language agents in Service</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/readme#language-agents-in-service">Agents</a>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme">Java agent</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/Supported-list">Supported middleware, framework and library</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#table-of-agent-configuration-properties">Agent Configuration Properties</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#optional-plugins">Optional plugins</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#bootstrap-class-plugins">Bootstrap/JVM class plugin</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#advanced-reporters">Advanced reporters</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#plugin-development-guide">Plugin development guide</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#plugin-development-guide">Agent plugin tests and performance tests</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/readme#language-agents-in-service">Other language agents</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Service Mesh</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/istio/readme">SkyWalking on Istio</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/envoy/als_setting/">ALS (access log service)</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/backend/backend-ui-setup">Backend, UI and CLI setup document</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/backend/backend-setup">Backend setup document</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/configuration-vocabulary">Configuration Vocabulary</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-setting-override">Overriding settings</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-ip-port">IP and port setting</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-init-mode">Backend init mode startup</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-cluster">Cluster management</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-k8s">Deploy in kubernetes</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-storage">Choose storage</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-receivers">Set receivers</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-fetcher">Open fetchers</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/trace-sampling">Trace sampling</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/slow-db-statement">Slow DB statement threshold</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/backend-oal-scripts">OAL scripts</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-alarm">Alarm</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/advanced-deployment">Advanced deployment options</a>
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+ <a href="/docs/main/v8.2.0/en/setup/backend/uninstrumented-gateways">Uninstrumented Gateways</a>
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+<nav id="TableOfContents">
+ <ul>
+ <li><a href="#oap-capabilities">OAP capabilities</a></li>
+ <li><a href="#tracing-in-oap">Tracing in OAP</a></li>
+ <li><a href="#metrics-in-oap">Metrics in OAP</a></li>
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+ <h1 id="observability-analysis-platform">Observability Analysis Platform</h1>
+<p>OAP(Observability Analysis Platform) is a new concept, which starts in SkyWalking 6.x. OAP replaces the
+old SkyWalking whole backend. The capabilities of the platform are following.</p>
+<h2 id="oap-capabilities">OAP capabilities</h2>
+<p>OAP accepts data from more sources, which belongs two groups: <strong>Tracing</strong> and <strong>Metrics</strong>.</p>
+<ul>
+<li><strong>Tracing</strong>. Including, SkyWalking native data formats. Zipkin v1,v2 data formats and Jaeger data formats.</li>
+<li><strong>Metrics</strong>. SkyWalking integrates with Service Mesh platforms, such as Istio, Envoy, Linkerd, to provide observability from data panel
+or control panel. Also, SkyWalking native agents can run in metrics mode, which highly improve the
+performance.</li>
+</ul>
+<p>At the same time by using any integration solution provided, such as SkyWalking log plugin or toolkits,
+SkyWalking provides visualization integration for binding tracing and logging together by using the
+trace id and span id.</p>
+<p>As usual, all services provided by gRPC and HTTP protocol to make integration easier for unsupported ecosystem.</p>
+<h2 id="tracing-in-oap">Tracing in OAP</h2>
+<p>Tracing in OAP has two ways to process.</p>
+<ol>
+<li>Traditional way in SkyWalking 5 series. Format tracing data in SkyWalking trace segment and span formats,
+even for Zipkin data format. The OAP analysis the segments to get metrics, and push the metrics data into
+the streaming aggregation.</li>
+<li>Consider tracing as some kinds of logging only. Just provide save and visualization capabilities for trace.</li>
+</ol>
+<p>Also, SkyWalking accepts trace formats from other project, such as Zipkin, Jaeger, OpenCensus.
+These formats could be processed in the two ways too.</p>
+<h2 id="metrics-in-oap">Metrics in OAP</h2>
+<p>Metrics in OAP is totally new feature in 6 series. Build observability for a distributed system based on metrics of connected nodes.
+No tracing data is required.</p>
+<p>Metrics data are aggregated inside OAP cluster in streaming mode. See about <a href="../oal">Observability Analysis Language</a>,
+which provides the easy way to do aggregation and analysis in script style.</p>
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diff --git a/docs/main/v8.2.0/en/concepts-and-designs/mal/index.html b/docs/main/v8.2.0/en/concepts-and-designs/mal/index.html
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+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/ui-overview">Overview</a>
+
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+
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+
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+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/readme">Setup</a></div>
+
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+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div >Language agents in Service</div>
+
+
+ <ul class="">
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+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/readme#language-agents-in-service">Agents</a>
+
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+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme">Java agent</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/Supported-list">Supported middleware, framework and library</a>
+
+ </li>
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+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#table-of-agent-configuration-properties">Agent Configuration Properties</a>
+
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+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#optional-plugins">Optional plugins</a>
+
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+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#bootstrap-class-plugins">Bootstrap/JVM class plugin</a>
+
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+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#advanced-reporters">Advanced reporters</a>
+
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+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#plugin-development-guide">Plugin development guide</a>
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+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#plugin-development-guide">Agent plugin tests and performance tests</a>
+
+ </li>
+
+
+</ul>
+
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+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/readme#language-agents-in-service">Other language agents</a>
+
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+ <div >Service Mesh</div>
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+ <ul class="">
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+
+ <a href="/docs/main/v8.2.0/en/setup/envoy/als_setting/">ALS (access log service)</a>
+
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+
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+
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+ <div ><a href="/docs/main/v8.2.0/en/setup/backend/backend-ui-setup">Backend, UI and CLI setup document</a></div>
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+ <div ><a href="/docs/main/v8.2.0/en/setup/backend/backend-setup">Backend setup document</a></div>
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+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-receivers">Set receivers</a>
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+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-fetcher">Open fetchers</a>
+
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+
+ <a href="/docs/main/v8.2.0/en/setup/backend/trace-sampling">Trace sampling</a>
+
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+ <a href="/docs/main/v8.2.0/en/setup/backend/slow-db-statement">Slow DB statement threshold</a>
+
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+ <a href="/docs/main/v8.2.0/en/guides/backend-oal-scripts">OAL scripts</a>
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+
+ <a href="/docs/main/v8.2.0/en/setup/backend/advanced-deployment">Advanced deployment options</a>
+
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+
+ <a href="/docs/main/v8.2.0/en/setup/backend/metrics-exporter">Metrics exporter</a>
+
+ </li>
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+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/ttl">Time To Live (TTL)</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/dynamic-config">Dynamic Configuration</a>
+
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+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/uninstrumented-gateways">Uninstrumented Gateways</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
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+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/ui-setup">UI setup document</a>
+
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+
+ <a href="https://github.com/apache/skywalking-cli">CLI setup document</a>
+
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+
+
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+ <a href="/docs/main/v8.2.0/en/ui/readme">UI Introduction</a>
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+ <a href="/docs/main/v8.2.0/en/guides/asf/committer">Process to become official Apache SkyWalking Committer</a>
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+ <a href="/docs/main/v8.2.0/en/guides/How-to-build">Compiling Guide</a>
+
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+
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+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/Java-Plugin-Development-Guide">Agent plugin development guide</a>
+
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+
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+ <a href="/docs/main/v8.2.0/en/protocols/readme">Protocols</a>
+
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+ <a href="/docs/main/v8.2.0/en/FAQ/readme">FAQs</a>
+
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+</ul>
+ <div class="commit-id">Commit Id: af02b66</div>
+
+
+</div>
+ <div id="toc" class="d-none d-xl-block col-xl-2 td-toc d-print-none">
+
+
+
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+
+<div class="td-page-meta ml-2 pb-1 pt-2 mb-0">
+
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+
+
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+
+
+</div>
+
+
+
+
+
+
+<nav id="TableOfContents">
+ <ul>
+ <li><a href="#language-data-type">Language data type</a></li>
+ <li><a href="#sample-family">Sample family</a>
+ <ul>
+ <li><a href="#tag-filter">Tag filter</a></li>
+ <li><a href="#binary-operators">Binary operators</a></li>
+ <li><a href="#aggregation-operation">Aggregation Operation</a></li>
+ <li><a href="#function">Function</a></li>
+ </ul>
+ </li>
+ <li><a href="#down-sampling-operation">Down Sampling Operation</a></li>
+ <li><a href="#metric-level-function">Metric level function</a></li>
+ <li><a href="#more-examples">More Examples</a></li>
+ </ul>
+</nav>
+
+
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+ <main class="col-12 col-md-9 col-xl-8 pl-md-5 pr-md-4" role="main">
+ <br>
+
+<div class="td-content">
+
+
+
+
+
+
+
+
+
+
+
+ <h1 id="meter-analysis-language">Meter Analysis Language</h1>
+<p>Meter system provides a functional analysis language called MAL(Meter Analysis Language) that lets the user analyze and
+aggregate meter data in OAP streaming system. The result of an expression can either be ingested by agent analyzer,
+or OC/Prometheus analyzer.</p>
+<h2 id="language-data-type">Language data type</h2>
+<p>In MAL, an expression or sub-expression can evaluate to one of two types:</p>
+<ul>
+<li>Sample family - a set of samples(metrics) containing a range of metrics whose name is identical.</li>
+<li>Scalar - a simple numeric value. it supports integer/long, floating/double,</li>
+</ul>
+<h2 id="sample-family">Sample family</h2>
+<p>A set of samples, which is as the basic unit in MAL. For example:</p>
+<pre><code>instance_trace_count
+</code></pre><p>The above sample family might contains following simples which are provided by external modules, for instance, agent analyzer:</p>
+<pre><code>instance_trace_count{region="us-west",az="az-1"} 100
+instance_trace_count{region="us-east",az="az-3"} 20
+instance_trace_count{region="asia-north",az="az-1"} 33
+</code></pre><h3 id="tag-filter">Tag filter</h3>
+<p>MAL support four type operations to filter samples in a sample family:</p>
+<ul>
+<li>tagEqual: Filter tags that are exactly equal to the provided string.</li>
+<li>tagNotEqual: Filter tags that are not equal to the provided string.</li>
+<li>tagMatch: Filter tags that regex-match the provided string.</li>
+<li>tagNotMatch: Filter labels that do not regex-match the provided string.</li>
+</ul>
+<p>For example, this filters all instance_trace_count samples for us-west and asia-north region and az-1 az:</p>
+<pre><code>instance_trace_count.tagMatch("region", "us-west|asia-north").tagEqual("az", "az-1")
+</code></pre><h3 id="binary-operators">Binary operators</h3>
+<p>The following binary arithmetic operators are available in MAL:</p>
+<ul>
+<li>+ (addition)</li>
+<li>- (subtraction)</li>
+<li>* (multiplication)</li>
+<li>/ (division)</li>
+</ul>
+<p>Binary operators are defined between scalar/scalar, sampleFamily/scalar and sampleFamily/sampleFamily value pairs.</p>
+<p>Between two scalars: they evaluate to another scalar that is the result of the operator applied to both scalar operands:</p>
+<pre><code>1 + 2
+</code></pre><p>Between a sample family and a scalar, the operator is applied to the value of every sample in the smaple family. For example:</p>
+<pre><code>instance_trace_count + 2
+</code></pre><p>or</p>
+<pre><code>2 + instance_trace_count
+</code></pre><p>results in</p>
+<pre><code>instance_trace_count{region="us-west",az="az-1"} 102 // 100 + 2
+instance_trace_count{region="us-east",az="az-3"} 22 // 20 + 2
+instance_trace_count{region="asia-north",az="az-1"} 35 // 33 + 2
+</code></pre><p>Between two sample families, a binary operator is applied to each sample in the left-hand side sample family and
+its matching sample in the right-hand sample family. A new sample family with empty name will be generated.
+Only the matched tags will be reserved. Samples for which no matching sample in the right-hand sample family are not in the result.</p>
+<p>Another sample family <code>instance_trace_analysis_error_count</code> is</p>
+<pre><code>instance_trace_analysis_error_count{region="us-west",az="az-1"} 20
+instance_trace_analysis_error_count{region="asia-north",az="az-1"} 11
+</code></pre><p>Example expression:</p>
+<pre><code>instance_trace_analysis_error_count / instance_trace_count
+</code></pre><p>This returns a result sample family containing the error rate of trace analysis. The samples with region us-west and az az-3
+have no match and will not show up in the result:</p>
+<pre><code>{region="us-west",az="az-1"} 0.8 // 20 / 100
+{region="asia-north",az="az-1"} 0.3333 // 11 / 33
+</code></pre><h3 id="aggregation-operation">Aggregation Operation</h3>
+<p>Sample family supports the following aggregation operations that can be used to aggregate the samples of a single sample family,
+resulting in a new sample family of fewer samples(even single one) with aggregated values:</p>
+<ul>
+<li>sum (calculate sum over dimensions)</li>
+<li>min (select minimum over dimensions) (TODO)</li>
+<li>max (select maximum over dimensions) (TODO)</li>
+<li>avg (calculate the average over dimensions) (TODO)</li>
+</ul>
+<p>These operations can be used to aggregate over all label dimensions or preserve distinct dimensions by inputting <code>by</code> parameter.</p>
+<pre><code><aggr-op>(by: <tag1, tag2, ...>)
+</code></pre><p>Example expression:</p>
+<pre><code>instance_trace_count.sum(by: ['az'])
+</code></pre><p>will output a result:</p>
+<pre><code>instance_trace_count{az="az-1"} 133 // 100 + 33
+instance_trace_count{az="az-3"} 20
+</code></pre><h3 id="function">Function</h3>
+<p><code>Duraton</code> is a textual representation of a time range. The formats accepted are based on the ISO-8601 duration format {@code PnDTnHnMn.nS}
+with days considered to be exactly 24 hours.</p>
+<p>Examples:</p>
+<ul>
+<li>“PT20.345S” – parses as “20.345 seconds”</li>
+<li>“PT15M” – parses as “15 minutes” (where a minute is 60 seconds)</li>
+<li>“PT10H” – parses as “10 hours” (where an hour is 3600 seconds)</li>
+<li>“P2D” – parses as “2 days” (where a day is 24 hours or 86400 seconds)</li>
+<li>“P2DT3H4M” – parses as “2 days, 3 hours and 4 minutes”</li>
+<li>“P-6H3M” – parses as “-6 hours and +3 minutes”</li>
+<li>“-P6H3M” – parses as “-6 hours and -3 minutes”</li>
+<li>“-P-6H+3M” – parses as “+6 hours and -3 minutes”</li>
+</ul>
+<h4 id="increase">increase</h4>
+<p><code>increase(Duration)</code>. Calculates the increase in the time range.</p>
+<h4 id="rate">rate</h4>
+<p><code>rate(Duration)</code>. Calculates the per-second average rate of increase of the time range.</p>
+<h4 id="irate">irate</h4>
+<p><code>irate()</code>. Calculates the per-second instant rate of increase of the time range.</p>
+<h4 id="tag">tag</h4>
+<p><code>tag({allTags -> })</code>. Update tags of samples. User can add, drop, rename and update tags.</p>
+<h4 id="histogram">histogram</h4>
+<p><code>histogram(le: '<the tag name of le>')</code>. Transforms less based histogram buckets to meter system histogram buckets.
+<code>le</code> parameter hints the tag name of a bucket.</p>
+<h4 id="histogram_percentile">histogram_percentile</h4>
+<p><code>histogram_percentile([<p scalar>])</code>. Hints meter-system to calculates the p-percentile (0 ≤ p ≤ 100) from the buckets.</p>
+<h4 id="time">time</h4>
+<p><code>time()</code>. returns the number of seconds since January 1, 1970 UTC.</p>
+<h2 id="down-sampling-operation">Down Sampling Operation</h2>
+<p>MAL should instruct meter-system how to do downsampling for metrics. It doesn’t only refer to aggregate raw samples to
+<code>minute</code> level, but also hints data from <code>minute</code> to higher levels, for instance, <code>hour</code> and <code>day</code>.</p>
+<p>Down sampling operations are as global function in MAL:</p>
+<ul>
+<li>avg</li>
+<li>latest (TODO)</li>
+<li>min (TODO)</li>
+<li>max (TODO)</li>
+<li>mean (TODO)</li>
+<li>sum (TODO)</li>
+<li>count (TODO)</li>
+</ul>
+<p>The default one is <code>avg</code> if not specific an operation.</p>
+<p>If user want get latest time from <code>last_server_state_sync_time_in_seconds</code>:</p>
+<pre><code>latest(last_server_state_sync_time_in_seconds.tagEqual('production', 'catalog'))
+
+or
+
+latest last_server_state_sync_time_in_seconds.tagEqual('production', 'catalog')
+</code></pre><h2 id="metric-level-function">Metric level function</h2>
+<p>Metric has three level, service, instance and endpoint. They extract level relevant labels from metric labels, then
+hints meter-system which level this metrics should be.</p>
+<ul>
+<li><code>servcie([svc_label1, svc_label2...])</code> extracts service level labels from the array argument.</li>
+<li><code>instance([svc_label1, svc_label2...], [ins_label1, ins_label2...])</code> extracts service level labels from the first array argument,
+extracts instance level labels from the second array argument.</li>
+<li><code>endpoint([svc_label1, svc_label2...], [ep_label1, ep_label2...])</code> extracts service level labels from the first array argument,
+extracts endpoint level labels from the second array argument.</li>
+</ul>
+<h2 id="more-examples">More Examples</h2>
+<p>Please refer to <a href="https://github.com/apache/skywalking/tree/af02b66bbdde53380633a564b98353b66a5dc04d/oap-server/server-bootstrap/src/main/resources/fetcher-prom-rules/self.yaml">OAP Self-Observability</a></p>
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diff --git a/docs/main/v8.2.0/en/concepts-and-designs/manual-sdk/index.html b/docs/main/v8.2.0/en/concepts-and-designs/manual-sdk/index.html
new file mode 100644
index 0000000..114ffd0
--- /dev/null
+++ b/docs/main/v8.2.0/en/concepts-and-designs/manual-sdk/index.html
@@ -0,0 +1,1038 @@
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+ Go2Sky. Go SDK follows SkyWalking format. Welcome to consider contributing in following languages:
+ Python C++ What is SkyWalking formats and propagation protocols? See these protocols in protocols document.
+Can SkyWalking provide OpenCensus exporter in above languages? At the moment I am writing this document, NO. Because, OC(OpenCensus) don’t support context extendable mechanism, and no hook mechanism when manipulate spans.">
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+ Python C++ What is SkyWalking formats and propagation protocols? See these protocols in protocols document.
+Can SkyWalking provide OpenCensus exporter in above languages? At the moment I am writing this document, NO. Because, OC(OpenCensus) don’t support context extendable mechanism, and no hook mechanism when manipulate spans."/>
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+ <a href="/docs/main/v8.2.0/readme">Welcome</a>
+
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+
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+ <div ><a href="/docs/main/v8.2.0/en/concepts-and-designs/readme">Concepts and Designs</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div >What is SkyWalking?</div>
+
+
+ <ul class="">
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+
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+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/overview">Overview and Core concepts</a>
+
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+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/project-goals">Project Goals</a>
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+</ul>
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+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Probe</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/probe-introduction">Introduction</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/service-agent">Service auto instrument agent</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/manual-sdk">Manual instrument SDK</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/service-mesh-probe">Service Mesh probe</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Backend</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/backend-overview">Overview</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/oal">Observability Analysis Language</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/protocols/readme#query-protocol">Query in OAP</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >UI</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/ui-overview">Overview</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
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+
+ <li>
+
+
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+ <div ><a href="/docs/main/v8.2.0/en/setup/readme">Setup</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div >Language agents in Service</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/readme#language-agents-in-service">Agents</a>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme">Java agent</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/Supported-list">Supported middleware, framework and library</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#table-of-agent-configuration-properties">Agent Configuration Properties</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#optional-plugins">Optional plugins</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#bootstrap-class-plugins">Bootstrap/JVM class plugin</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#advanced-reporters">Advanced reporters</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#plugin-development-guide">Plugin development guide</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#plugin-development-guide">Agent plugin tests and performance tests</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/readme#language-agents-in-service">Other language agents</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Service Mesh</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/istio/readme">SkyWalking on Istio</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/envoy/als_setting/">ALS (access log service)</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/backend/backend-ui-setup">Backend, UI and CLI setup document</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/backend/backend-setup">Backend setup document</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/configuration-vocabulary">Configuration Vocabulary</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-setting-override">Overriding settings</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-ip-port">IP and port setting</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-init-mode">Backend init mode startup</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-cluster">Cluster management</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-k8s">Deploy in kubernetes</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-storage">Choose storage</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-receivers">Set receivers</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-fetcher">Open fetchers</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/trace-sampling">Trace sampling</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/slow-db-statement">Slow DB statement threshold</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/backend-oal-scripts">OAL scripts</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-alarm">Alarm</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/advanced-deployment">Advanced deployment options</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/metrics-exporter">Metrics exporter</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/ttl">Time To Live (TTL)</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/dynamic-config">Dynamic Configuration</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/uninstrumented-gateways">Uninstrumented Gateways</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/ui-setup">UI setup document</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="https://github.com/apache/skywalking-cli">CLI setup document</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/ui/readme">UI Introduction</a>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/guides/readme">Contributing Guides</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/readme#contact-us">Contact us</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/asf/committer">Process to become official Apache SkyWalking Committer</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/How-to-build">Compiling Guide</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/Java-Plugin-Development-Guide">Agent plugin development guide</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/protocols/readme">Protocols</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/FAQ/readme">FAQs</a>
+
+ </li>
+
+
+</ul>
+ <div class="commit-id">Commit Id: af02b66</div>
+
+
+</div>
+ <div id="toc" class="d-none d-xl-block col-xl-2 td-toc d-print-none">
+
+
+
+
+
+<div class="td-page-meta ml-2 pb-1 pt-2 mb-0">
+
+
+
+
+
+
+
+
+
+
+
+</div>
+
+
+
+
+
+
+<nav id="TableOfContents">
+ <ul>
+ <li><a href="#what-is-skywalking-formats-and-propagation-protocols">What is SkyWalking formats and propagation protocols?</a></li>
+ <li><a href="#can-skywalking-provide-opencensus-exporter-in-above-languages">Can SkyWalking provide OpenCensus exporter in above languages?</a></li>
+ <li><a href="#how-about-zipkin-instrument-sdks">How about Zipkin instrument SDKs?</a></li>
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+ <h1 id="manual-instrument-sdk">Manual instrument SDK</h1>
+<p>We have manual instrument SDK contributed from the community.</p>
+<ul>
+<li><a href="https://github.com/SkyAPM/go2sky">Go2Sky</a>. Go SDK follows SkyWalking format.</li>
+</ul>
+<p>Welcome to consider contributing in following languages:</p>
+<ul>
+<li>Python</li>
+<li>C++</li>
+</ul>
+<h2 id="what-is-skywalking-formats-and-propagation-protocols">What is SkyWalking formats and propagation protocols?</h2>
+<p>See these protocols in <a href="../../protocols/readme">protocols document</a>.</p>
+<h2 id="can-skywalking-provide-opencensus-exporter-in-above-languages">Can SkyWalking provide OpenCensus exporter in above languages?</h2>
+<p>At the moment I am writing this document, <strong>NO</strong>. Because, OC(OpenCensus) don’t support context extendable
+mechanism, and no hook mechanism when manipulate spans. SkyWalking relied on those to propagate more things
+than trace id and span id.</p>
+<p>We are already in the middle of discussion, see <a href="https://github.com/census-instrumentation/opencensus-specs/issues/70">https://github.com/census-instrumentation/opencensus-specs/issues/70</a>.
+After OC provides this officially, we can.</p>
+<h2 id="how-about-zipkin-instrument-sdks">How about Zipkin instrument SDKs?</h2>
+<p>See <a href="../../setup/backend/backend-receivers">Zipkin receiver</a> in backend <strong>Choose receiver</strong> section.</p>
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diff --git a/docs/main/v8.2.0/en/concepts-and-designs/meter/index.html b/docs/main/v8.2.0/en/concepts-and-designs/meter/index.html
new file mode 100644
index 0000000..2a7d602
--- /dev/null
+++ b/docs/main/v8.2.0/en/concepts-and-designs/meter/index.html
@@ -0,0 +1,1031 @@
+<!doctype html>
+<html lang="en" class="no-js">
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+The meter system is open to different receivers and fetchers in the backend, follow the backend setup document for more details.
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+The meter system is open to different receivers and fetchers in the backend, follow the backend setup document for more details.
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+ <a href="/docs/main/v8.2.0/readme">Welcome</a>
+
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+
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+ <div ><a href="/docs/main/v8.2.0/en/concepts-and-designs/readme">Concepts and Designs</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
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+ <div >What is SkyWalking?</div>
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+
+
+
+ <li>
+
+
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+ <div >Probe</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/probe-introduction">Introduction</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/service-agent">Service auto instrument agent</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/manual-sdk">Manual instrument SDK</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/service-mesh-probe">Service Mesh probe</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Backend</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/backend-overview">Overview</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/oal">Observability Analysis Language</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/protocols/readme#query-protocol">Query in OAP</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >UI</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/ui-overview">Overview</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/readme">Setup</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div >Language agents in Service</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/readme#language-agents-in-service">Agents</a>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme">Java agent</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/Supported-list">Supported middleware, framework and library</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#table-of-agent-configuration-properties">Agent Configuration Properties</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#optional-plugins">Optional plugins</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#bootstrap-class-plugins">Bootstrap/JVM class plugin</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#advanced-reporters">Advanced reporters</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#plugin-development-guide">Plugin development guide</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#plugin-development-guide">Agent plugin tests and performance tests</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/readme#language-agents-in-service">Other language agents</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Service Mesh</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/istio/readme">SkyWalking on Istio</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/envoy/als_setting/">ALS (access log service)</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/backend/backend-ui-setup">Backend, UI and CLI setup document</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
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+
+ <h1 id="meter-system">Meter System</h1>
+<p>Meter system is another streaming calculation mode, especially for metrics data. In the <a href="../oal">OAL</a>, there are clear
+<a href="../scope-definitions">Scope Definitions</a>, including native objects. Meter system is focusing on the data type itself,
+and provides more flexible to the end user to define the scope entity.</p>
+<p>The meter system is open to different receivers and fetchers in the backend,
+follow the <a href="../../setup/backend/backend-setup">backend setup document</a> for more details.</p>
+<p>Every metrics is declared in the meter system should include following attribute</p>
+<ol>
+<li><strong>Metrics Name</strong>. An unique name globally, should avoid overlap the OAL variable names.</li>
+<li><strong>Function Name</strong>. The function used for this metrics, distributed aggregation, value calculation and down sampling calculation
+based on the function implementation. Also, the data structure is determined by the function too, such as function Avg is for Long.</li>
+<li><strong>Scope Type</strong>. Unlike inside the OAL, there are plenty of logic scope definitions, in meter system, only type is required.
+Type values include service, instance, and endpoint, like we introduced in the Overview.
+The values of scope entity name, such as service name, are required when metrics data generated with the metrics data value.</li>
+</ol>
+<p>NOTICE, the metrics must be declared in the bootstrap stage, no runtime changed.</p>
+<p>Meter System supports following binding functions</p>
+<ul>
+<li><strong>avg</strong>. Calculate the avg value for every entity in the same metrics name.</li>
+<li><strong>histogram</strong>. Aggregate the counts in the configurable buckets, buckets is configurable but must be assigned in the declaration stage.</li>
+<li><strong>percentile</strong>. Read <a href="https://en.wikipedia.org/wiki/Percentile">percentile in WIKI</a>. Unlike in the OAL, we provide
+50/75/90/95/99 in default, in the meter system function, percentile function accepts several ranks, which should be in
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+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/overview">Overview and Core concepts</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/project-goals">Project Goals</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Probe</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/probe-introduction">Introduction</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/service-agent">Service auto instrument agent</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/manual-sdk">Manual instrument SDK</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/service-mesh-probe">Service Mesh probe</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Backend</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/backend-overview">Overview</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/oal">Observability Analysis Language</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/protocols/readme#query-protocol">Query in OAP</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >UI</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/ui-overview">Overview</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/readme">Setup</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div >Language agents in Service</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/readme#language-agents-in-service">Agents</a>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme">Java agent</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/Supported-list">Supported middleware, framework and library</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#table-of-agent-configuration-properties">Agent Configuration Properties</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#optional-plugins">Optional plugins</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#bootstrap-class-plugins">Bootstrap/JVM class plugin</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#advanced-reporters">Advanced reporters</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#plugin-development-guide">Plugin development guide</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#plugin-development-guide">Agent plugin tests and performance tests</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/readme#language-agents-in-service">Other language agents</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Service Mesh</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/istio/readme">SkyWalking on Istio</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/envoy/als_setting/">ALS (access log service)</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/backend/backend-ui-setup">Backend, UI and CLI setup document</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/backend/backend-setup">Backend setup document</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/configuration-vocabulary">Configuration Vocabulary</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-setting-override">Overriding settings</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-ip-port">IP and port setting</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-init-mode">Backend init mode startup</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-cluster">Cluster management</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-k8s">Deploy in kubernetes</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-storage">Choose storage</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-receivers">Set receivers</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-fetcher">Open fetchers</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/trace-sampling">Trace sampling</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/slow-db-statement">Slow DB statement threshold</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/backend-oal-scripts">OAL scripts</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-alarm">Alarm</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/advanced-deployment">Advanced deployment options</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/metrics-exporter">Metrics exporter</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/ttl">Time To Live (TTL)</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/dynamic-config">Dynamic Configuration</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/uninstrumented-gateways">Uninstrumented Gateways</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/ui-setup">UI setup document</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="https://github.com/apache/skywalking-cli">CLI setup document</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/ui/readme">UI Introduction</a>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/guides/readme">Contributing Guides</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/readme#contact-us">Contact us</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/asf/committer">Process to become official Apache SkyWalking Committer</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/How-to-build">Compiling Guide</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/Java-Plugin-Development-Guide">Agent plugin development guide</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/protocols/readme">Protocols</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/FAQ/readme">FAQs</a>
+
+ </li>
+
+
+</ul>
+ <div class="commit-id">Commit Id: af02b66</div>
+
+
+</div>
+ <div id="toc" class="d-none d-xl-block col-xl-2 td-toc d-print-none">
+
+
+
+
+
+<div class="td-page-meta ml-2 pb-1 pt-2 mb-0">
+
+
+
+
+
+
+
+
+
+
+
+</div>
+
+
+
+
+
+
+<nav id="TableOfContents">
+ <ul>
+ <li><a href="#grammar">Grammar</a></li>
+ <li><a href="#scope">Scope</a></li>
+ <li><a href="#filter">Filter</a></li>
+ <li><a href="#aggregation-function">Aggregation Function</a></li>
+ <li><a href="#metrics-name">Metrics name</a></li>
+ <li><a href="#group">Group</a></li>
+ <li><a href="#disable">Disable</a></li>
+ <li><a href="#examples">Examples</a></li>
+ </ul>
+</nav>
+
+
+
+
+<script>
+ $(function () {
+ var $toc = $("#TableOfContents");
+ if (!$toc || !$toc.length) {
+ return;
+ }
+ var top = $toc.offset().top;
+
+ window.onscroll = debounce(setTop)
+
+ function setTop() {
+ var scrollValue = $(window).scrollTop();
+ if (scrollValue >= top - 70) {
+ $toc.addClass('fix')
+ } else {
+ $toc.removeClass('fix')
+ }
+ }
+
+ function debounce(fn, wait = 200) {
+ var timeout = null;
+ return function () {
+ clearTimeout(timeout);
+ timeout = setTimeout(() => {
+ fn.apply(this, arguments);
+ }, wait);
+ };
+ }
+ })
+
+</script>
+
+ </div>
+ <main class="col-12 col-md-9 col-xl-8 pl-md-5 pr-md-4" role="main">
+ <br>
+
+<div class="td-content">
+
+
+
+
+
+
+
+
+
+
+
+ <h1 id="observability-analysis-language">Observability Analysis Language</h1>
+<p>Provide OAL(Observability Analysis Language) to analysis incoming data in streaming mode.</p>
+<p>OAL focuses on metrics in Service, Service Instance and Endpoint. Because of that, the language is easy to
+learn and use.</p>
+<p>Since 6.3, the OAL engine is embedded in OAP server runtime, as <code>oal-rt</code>(OAL Runtime).
+OAL scripts now locate in <code>/config</code> folder, user could simply change and reboot the server to make it effective.
+But still, OAL script is compile language, OAL Runtime generates java codes dynamically.</p>
+<p>You could open set <code>SW_OAL_ENGINE_DEBUG=Y</code> at system env, to see which classes generated.</p>
+<h2 id="grammar">Grammar</h2>
+<p>Scripts should be named as <code>*.oal</code></p>
+<pre><code>// Declare the metrics.
+METRICS_NAME = from(SCOPE.(* | [FIELD][,FIELD ...]))
+[.filter(FIELD OP [INT | STRING])]
+.FUNCTION([PARAM][, PARAM ...])
+
+// Disable hard code
+disable(METRICS_NAME);
+</code></pre><h2 id="scope">Scope</h2>
+<p>Primary <strong>SCOPE</strong>s are <code>All</code>, <code>Service</code>, <code>ServiceInstance</code>, <code>Endpoint</code>, <code>ServiceRelation</code>, <code>ServiceInstanceRelation</code>, <code>EndpointRelation</code>.
+Also there are some secondary scopes, which belongs to one primary scope.</p>
+<p>Read <a href="../scope-definitions">Scope Definitions</a>, you can find all existing Scopes and Fields.</p>
+<h2 id="filter">Filter</h2>
+<p>Use filter to build the conditions for the value of fields, by using field name and expression.</p>
+<p>The expressions support to link by <code>and</code>, <code>or</code> and <code>(...)</code>.
+The OPs support <code>==</code>, <code>!=</code>, <code>></code>, <code><</code>, <code>>=</code>, <code><=</code>, <code>in [...]</code> ,<code>like %...</code>, <code>like ...%</code> and <code>like %...%</code>, with type detection based of field type. Trigger compile
+or code generation error if incompatible.</p>
+<h2 id="aggregation-function">Aggregation Function</h2>
+<p>The default functions are provided by SkyWalking OAP core, and could implement more.</p>
+<p>Provided functions</p>
+<ul>
+<li><code>longAvg</code>. The avg of all input per scope entity. The input field must be a long.</li>
+</ul>
+<blockquote>
+<p>instance_jvm_memory_max = from(ServiceInstanceJVMMemory.max).longAvg();</p>
+</blockquote>
+<p>In this case, input are request of each ServiceInstanceJVMMemory scope, avg is based on field <code>max</code>.</p>
+<ul>
+<li><code>doubleAvg</code>. The avg of all input per scope entity. The input field must be a double.</li>
+</ul>
+<blockquote>
+<p>instance_jvm_cpu = from(ServiceInstanceJVMCPU.usePercent).doubleAvg();</p>
+</blockquote>
+<p>In this case, input are request of each ServiceInstanceJVMCPU scope, avg is based on field <code>usePercent</code>.</p>
+<ul>
+<li><code>percent</code>. The number or ratio expressed as a fraction of 100, for the condition matched input.</li>
+</ul>
+<blockquote>
+<p>endpoint_percent = from(Endpoint.*).percent(status == true);</p>
+</blockquote>
+<p>In this case, all input are requests of each endpoint, condition is <code>endpoint.status == true</code>.</p>
+<ul>
+<li><code>rate</code>. The rate expressed as a fraction of 100, for the condition matched input.</li>
+</ul>
+<blockquote>
+<p>browser_app_error_rate = from(BrowserAppTraffic.*).rate(trafficCategory == BrowserAppTrafficCategory.FIRST_ERROR, trafficCategory == BrowserAppTrafficCategory.NORMAL);</p>
+</blockquote>
+<p>In this case, all input are requests of each browser app traffic, <code>numerator</code> condition is <code>trafficCategory == BrowserAppTrafficCategory.FIRST_ERROR</code> and <code>denominator</code> condition is <code>trafficCategory == BrowserAppTrafficCategory.NORMAL</code>.
+The parameter (1) is the <code>numerator</code> condition.
+The parameter (2) is the <code>denominator</code> condition.</p>
+<ul>
+<li><code>sum</code>. The sum calls per scope entity.</li>
+</ul>
+<blockquote>
+<p>service_calls_sum = from(Service.*).sum();</p>
+</blockquote>
+<p>In this case, calls of each service.</p>
+<ul>
+<li><code>histogram</code>. Read <a href="https://en.wikipedia.org/wiki/Heat_map">Heatmap in WIKI</a></li>
+</ul>
+<blockquote>
+<p>all_heatmap = from(All.latency).histogram(100, 20);</p>
+</blockquote>
+<p>In this case, thermodynamic heatmap of all incoming requests.
+The parameter (1) is the precision of latency calculation, such as in above case, 113ms and 193ms are considered same in the 101-200ms group.
+The parameter (2) is the group amount. In above case, 21(param value + 1) groups are 0-100ms, 101-200ms, … 1901-2000ms, 2000+ms</p>
+<ul>
+<li><code>apdex</code>. Read <a href="https://en.wikipedia.org/wiki/Apdex">Apdex in WIKI</a></li>
+</ul>
+<blockquote>
+<p>service_apdex = from(Service.latency).apdex(name, status);</p>
+</blockquote>
+<p>In this case, apdex score of each service.
+The parameter (1) is the service name, which effects the Apdex threshold value loaded from service-apdex-threshold.yml in the config folder.
+The parameter (2) is the status of this request. The status(success/failure) effects the Apdex calculation.</p>
+<ul>
+<li><code>p99</code>, <code>p95</code>, <code>p90</code>, <code>p75</code>, <code>p50</code>. Read <a href="https://en.wikipedia.org/wiki/Percentile">percentile in WIKI</a></li>
+</ul>
+<blockquote>
+<p>all_percentile = from(All.latency).percentile(10);</p>
+</blockquote>
+<p><strong>percentile</strong> is the first multiple value metrics, introduced since 7.0.0. As having multiple values, it could be query through <code>getMultipleLinearIntValues</code> GraphQL query.
+In this case, <code>p99</code>, <code>p95</code>, <code>p90</code>, <code>p75</code>, <code>p50</code> of all incoming request. The parameter is the precision of p99 latency calculation, such as in above case, 120ms and 124 are considered same.
+Before 7.0.0, use <code>p99</code>, <code>p95</code>, <code>p90</code>, <code>p75</code>, <code>p50</code> func(s) to calculate metrics separately. Still supported in 7.x, but don’t be recommended, and don’t be included in official OAL script.</p>
+<blockquote>
+<p>all_p99 = from(All.latency).p99(10);</p>
+</blockquote>
+<p>In this case, p99 value of all incoming requests. The parameter is the precision of p99 latency calculation, such as in above case, 120ms and 124 are considered same.</p>
+<h2 id="metrics-name">Metrics name</h2>
+<p>The metrics name for storage implementor, alarm and query modules. The type inference supported by core.</p>
+<h2 id="group">Group</h2>
+<p>All metrics data will be grouped by Scope.ID and min-level TimeBucket.</p>
+<ul>
+<li>In <code>Endpoint</code> scope, the Scope.ID = Endpoint id (the unique id based on service and its Endpoint)</li>
+</ul>
+<h2 id="disable">Disable</h2>
+<p><code>Disable</code> is an advanced statement in OAL, which is only used in certain case.
+Some of the aggregation and metrics are defined through core hard codes,
+this <code>disable</code> statement is designed for make them de-active,
+such as <code>segment</code>, <code>top_n_database_statement</code>.
+In default, no one is being disable.</p>
+<h2 id="examples">Examples</h2>
+<pre><code>// Caculate p99 of both Endpoint1 and Endpoint2
+endpoint_p99 = from(Endpoint.latency).filter(name in ("Endpoint1", "Endpoint2")).summary(0.99)
+
+// Caculate p99 of Endpoint name started with `serv`
+serv_Endpoint_p99 = from(Endpoint.latency).filter(name like "serv%").summary(0.99)
+
+// Caculate the avg response time of each Endpoint
+endpoint_avg = from(Endpoint.latency).avg()
+
+// Caculate the p50, p75, p90, p95 and p99 of each Endpoint by 50 ms steps.
+endpoint_percentile = from(Endpoint.latency).percentile(10)
+
+// Caculate the percent of response status is true, for each service.
+endpoint_success = from(Endpoint.*).filter(status == true).percent()
+
+// Caculate the sum of response code in [404, 500, 503], for each service.
+endpoint_abnormal = from(Endpoint.*).filter(responseCode in [404, 500, 503]).sum()
+
+// Caculate the sum of request type in [RequestType.PRC, RequestType.gRPC], for each service.
+endpoint_rpc_calls_sum = from(Endpoint.*).filter(type in [RequestType.PRC, RequestType.gRPC]).sum()
+
+// Caculate the sum of endpoint name in ["/v1", "/v2"], for each service.
+endpoint_url_sum = from(Endpoint.*).filter(endpointName in ["/v1", "/v2"]).sum()
+
+// Caculate the sum of calls for each service.
+endpoint_calls = from(Endpoint.*).sum()
+
+disable(segment);
+disable(endpoint_relation_server_side);
+disable(top_n_database_statement);
+</code></pre>
+
+
+
+</div>
+
+
+ </main>
+ </div>
+ </div>
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new file mode 100644
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+ <h5>Documentation: v8.2.0</h5>
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/readme">Welcome</a>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/concepts-and-designs/readme">Concepts and Designs</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div >What is SkyWalking?</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/overview">Overview and Core concepts</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/project-goals">Project Goals</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Probe</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/probe-introduction">Introduction</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/service-agent">Service auto instrument agent</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/manual-sdk">Manual instrument SDK</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/service-mesh-probe">Service Mesh probe</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Backend</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/backend-overview">Overview</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/oal">Observability Analysis Language</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/protocols/readme#query-protocol">Query in OAP</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >UI</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/ui-overview">Overview</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/readme">Setup</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div >Language agents in Service</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/readme#language-agents-in-service">Agents</a>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme">Java agent</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/Supported-list">Supported middleware, framework and library</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#table-of-agent-configuration-properties">Agent Configuration Properties</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#optional-plugins">Optional plugins</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#bootstrap-class-plugins">Bootstrap/JVM class plugin</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#advanced-reporters">Advanced reporters</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#plugin-development-guide">Plugin development guide</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#plugin-development-guide">Agent plugin tests and performance tests</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/readme#language-agents-in-service">Other language agents</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Service Mesh</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/istio/readme">SkyWalking on Istio</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/envoy/als_setting/">ALS (access log service)</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/backend/backend-ui-setup">Backend, UI and CLI setup document</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/backend/backend-setup">Backend setup document</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/configuration-vocabulary">Configuration Vocabulary</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-setting-override">Overriding settings</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-ip-port">IP and port setting</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-init-mode">Backend init mode startup</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-cluster">Cluster management</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-k8s">Deploy in kubernetes</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-storage">Choose storage</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-receivers">Set receivers</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-fetcher">Open fetchers</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/trace-sampling">Trace sampling</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/slow-db-statement">Slow DB statement threshold</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/backend-oal-scripts">OAL scripts</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-alarm">Alarm</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/advanced-deployment">Advanced deployment options</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/metrics-exporter">Metrics exporter</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/ttl">Time To Live (TTL)</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/dynamic-config">Dynamic Configuration</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/uninstrumented-gateways">Uninstrumented Gateways</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/ui-setup">UI setup document</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="https://github.com/apache/skywalking-cli">CLI setup document</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/ui/readme">UI Introduction</a>
+
+ </li>
+
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+<p>SkyWalking: an open source observability platform used to collect, analyze, aggregate and visualize data from services and cloud native
+infrastructures. SkyWalking provides an easy way to maintain a clear view of your distributed systems, even across Clouds.
+It is a modern APM, specially designed for cloud native, container based distributed systems.</p>
+<h2 id="why-use-skywalking">Why use SkyWalking?</h2>
+<p>SkyWalking provides solutions for observing and monitoring distributed systems, in many different scenarios. First of all,
+like traditional approaches, SkyWalking provides auto instrument agents for services, such as Java, C#, Node.js, Go, PHP and Nginx LUA.
+(with calls out for Python and C++ SDK contributions).
+In multilanguage, continuously deployed environments, cloud native infrastructures grow more powerful but also more complex.
+SkyWalking’s service mesh receiver allows SkyWalking to receive telemetry data from service mesh frameworks
+such as Istio/Envoy and Linkerd, allowing users to understanding the entire distributed system.</p>
+<p>SkyWalking provides observability capabilities for <strong>service</strong>(s), <strong>service instance</strong>(s), <strong>endpoint</strong>(s). The terms Service,
+Instance and Endpoint are used everywhere today, so it is worth defining their specific meanings in the context of SkyWalking:</p>
+<ul>
+<li><strong>Service</strong>. Represents a set/group of workloads which provide the same behaviours for incoming requests. You can define the service
+name when you are using instrument agents or SDKs. SkyWalking can also use the name you define in platforms such as Istio.</li>
+<li><strong>Service Instance</strong>. Each individual workload in the Service group is known as an instance. Like <code>pods</code> in Kubernetes, it
+doesn’t need to be a single OS process, however, if you are using instrument agents, an instance is actually a real OS process.</li>
+<li><strong>Endpoint</strong>. A path in a service for incoming requests, such as an HTTP URI path or a gRPC service class + method signature.</li>
+</ul>
+<p>SkyWalking allows users to understand the topology relationship between Services and Endpoints, to view the metrics of every
+Service/Service Instance/Endpoint and to set alarm rules.</p>
+<p>In addition, you can integrate</p>
+<ol>
+<li>Other distributed tracing useing SkyWalking native agents and SDKs with Zipkin, Jaeger and OpenCensus.</li>
+<li>Other metrics systems, such as Prometheus, Sleuth(Micrometer).</li>
+</ol>
+<h2 id="architecture">Architecture</h2>
+<p>SkyWalking is logically split into four parts: Probes, Platform backend, Storage and UI.</p>
+<img src="https://skywalking.apache.org/assets/frame-v8.jpg?u=20200423"/>
+<ul>
+<li><strong>Probe</strong>s collect data and reformat them for SkyWalking requirements (different probes support different sources).</li>
+<li><strong>Platform backend</strong>, supports data aggregation, analysis and drives process flow from probes to the UI. The analysis includes
+SkyWalking natives traces and metrics, 3rd party, including Istio and Envoy telemetry, Zipkin trace format, etc. You even can
+customize aggregation and analysis by using <a href="../oal">Observability Analysis Language for native metrics</a> and <a href="../meter">Meter System for extension metrics</a>.</li>
+<li><strong>Storage</strong> houses SkyWalking data through an open/plugable interface. You can choose an existing implementation, such as
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+</ul>
+<h2 id="what-is-next">What is next?</h2>
+<ul>
+<li>Learn SkyWalking’s <a href="../project-goals">Project Goals</a></li>
+<li>FAQ, <a href="../../faq/why_mq_not_involved">Why doesn’t SkyWalking involve MQ in the architecture?</a></li>
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diff --git a/docs/main/v8.2.0/en/concepts-and-designs/probe-introduction/index.html b/docs/main/v8.2.0/en/concepts-and-designs/probe-introduction/index.html
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@@ -0,0 +1,1048 @@
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+In high level, there are three typical groups in all SkyWalking probes.
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+ <a href="/docs/main/v8.2.0/readme">Welcome</a>
+
+ </li>
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+ <div ><a href="/docs/main/v8.2.0/en/concepts-and-designs/readme">Concepts and Designs</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div >What is SkyWalking?</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/overview">Overview and Core concepts</a>
+
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+
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+
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+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/project-goals">Project Goals</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Probe</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/probe-introduction">Introduction</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/service-agent">Service auto instrument agent</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/manual-sdk">Manual instrument SDK</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/service-mesh-probe">Service Mesh probe</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Backend</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/backend-overview">Overview</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/oal">Observability Analysis Language</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/protocols/readme#query-protocol">Query in OAP</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >UI</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/ui-overview">Overview</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/readme">Setup</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div >Language agents in Service</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/readme#language-agents-in-service">Agents</a>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme">Java agent</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/Supported-list">Supported middleware, framework and library</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#table-of-agent-configuration-properties">Agent Configuration Properties</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#optional-plugins">Optional plugins</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#bootstrap-class-plugins">Bootstrap/JVM class plugin</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#advanced-reporters">Advanced reporters</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#plugin-development-guide">Plugin development guide</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#plugin-development-guide">Agent plugin tests and performance tests</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/readme#language-agents-in-service">Other language agents</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Service Mesh</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/istio/readme">SkyWalking on Istio</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/envoy/als_setting/">ALS (access log service)</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/backend/backend-ui-setup">Backend, UI and CLI setup document</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/backend/backend-setup">Backend setup document</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/configuration-vocabulary">Configuration Vocabulary</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-setting-override">Overriding settings</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-ip-port">IP and port setting</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-init-mode">Backend init mode startup</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-cluster">Cluster management</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-k8s">Deploy in kubernetes</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-storage">Choose storage</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-receivers">Set receivers</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-fetcher">Open fetchers</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/trace-sampling">Trace sampling</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/slow-db-statement">Slow DB statement threshold</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/backend-oal-scripts">OAL scripts</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-alarm">Alarm</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/advanced-deployment">Advanced deployment options</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/metrics-exporter">Metrics exporter</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/ttl">Time To Live (TTL)</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/dynamic-config">Dynamic Configuration</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/uninstrumented-gateways">Uninstrumented Gateways</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/ui-setup">UI setup document</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="https://github.com/apache/skywalking-cli">CLI setup document</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/ui/readme">UI Introduction</a>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/guides/readme">Contributing Guides</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/readme#contact-us">Contact us</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/asf/committer">Process to become official Apache SkyWalking Committer</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/How-to-build">Compiling Guide</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/Java-Plugin-Development-Guide">Agent plugin development guide</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/protocols/readme">Protocols</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/FAQ/readme">FAQs</a>
+
+ </li>
+
+
+</ul>
+ <div class="commit-id">Commit Id: af02b66</div>
+
+
+</div>
+ <div id="toc" class="d-none d-xl-block col-xl-2 td-toc d-print-none">
+
+
+
+
+
+<div class="td-page-meta ml-2 pb-1 pt-2 mb-0">
+
+
+
+
+
+
+
+
+
+
+
+</div>
+
+
+
+
+
+
+
+
+
+<script>
+ $(function () {
+ var $toc = $("#TableOfContents");
+ if (!$toc || !$toc.length) {
+ return;
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+
+ window.onscroll = debounce(setTop)
+
+ function setTop() {
+ var scrollValue = $(window).scrollTop();
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+ return function () {
+ clearTimeout(timeout);
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+ <main class="col-12 col-md-9 col-xl-8 pl-md-5 pr-md-4" role="main">
+ <br>
+
+<div class="td-content">
+
+
+
+
+
+
+
+
+
+
+
+ <h1 id="probe-introduction">Probe Introduction</h1>
+<p>In SkyWalking, probe means an agent or SDK library integrated into target system, which take charge of
+collecting telemetry data including tracing and metrics. Based on the target system tech stack, probe could use very different
+ways to do so. But ultimately they are same, just collect and reformat data, then send to backend.</p>
+<p>In high level, there are three typical groups in all SkyWalking probes.</p>
+<ul>
+<li>
+<p><strong>Language based native agent</strong>. This kind of agents runs in target service user space, like a part of user codes. Such as
+SkyWalking Java agent, use <code>-javaagent</code> command line argument to manipulate codes in runtime, <code>manipulate</code> means change and inject
+user’s codes. Another kind of agents is using some hook or intercept mechanism provided by target libraries. So you can see, these kinds
+of agents based on languages and libraries.</p>
+</li>
+<li>
+<p><strong>Service Mesh probe</strong>. Service Mesh probe collects data from sidecar, control panel in service mesh or proxy. In old days, proxy
+is only used as ingress of the whole cluster, but with the Service Mesh and sidecar, now we can do observe based on that.</p>
+</li>
+<li>
+<p><strong>3rd-party instrument library</strong>. SkyWalking accepts other popular used instrument libraries data format. It analysis the
+data, transfer it to SkyWalking formats of trace, metrics or both. This feature starts with accepting Zipkin span data. See
+<a href="../../setup/backend/backend-receivers">Receiver for other tracers</a> to know more.</p>
+</li>
+</ul>
+<p>You don’t need to use <strong>Language based native agent</strong> and <strong>Service Mesh probe</strong> at the same time, because they both collect
+metrics data. As a result of that, your system suffers twice payloads, and the analytic numbers are doubled.</p>
+<p>There are several recommend ways in using these probes:</p>
+<ol>
+<li>Use <strong>Language based native agent</strong> only.</li>
+<li>Use <strong>3rd-party instrument library</strong> only, like Zipkin instrument ecosystem.</li>
+<li>Use <strong>Service Mesh probe</strong> only.</li>
+<li>Use <strong>Service Mesh probe</strong> with <strong>Language based native agent</strong> or <strong>3rd-party instrument library</strong> in tracing status. (Advanced usage)</li>
+</ol>
+<p>In addition, let’s example what is the meaning of <strong>in tracing status</strong>?</p>
+<p>In default, <strong>Language based native agent</strong> and <strong>3rd-party instrument library</strong> both send distributed traces to backend,
+which do analysis and aggregate on those traces. <strong>In tracing status</strong> means, backend considers these traces as something
+like logs, just save them, and build the links between traces and metrics, like <code>which endpoint and service does the trace belong?</code>.</p>
+<h2 id="what-is-next">What is next?</h2>
+<ul>
+<li>Learn the SkyWalking supported probes in <a href="../service-agent">Service auto instrument agent</a>, <a href="../manual-sdk">Manual instrument SDK</a>,
+<a href="../service-mesh-probe">Service Mesh probe</a> and <a href="../trace-receiver">Zipkin receiver</a>.</li>
+<li>After understand the probe, read <a href="../backend-overview">backend overview</a> for understanding analysis and persistence.</li>
+</ul>
+
+
+
+
+</div>
+
+
+ </main>
+ </div>
+ </div>
+
+
+<footer class="bg-dark py-5 sky-row">
+ <div class="container-fluid text-center">
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diff --git a/docs/main/v8.2.0/en/concepts-and-designs/project-goals/index.html b/docs/main/v8.2.0/en/concepts-and-designs/project-goals/index.html
new file mode 100644
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+<meta property="og:description" content="Design Goals The document outlines the core design goals for SkyWalking project.
+ Keep Observability. No matter how does the target system deploy, SkyWalking could provide a solution or integration way to keep observability for it. Based on this, SkyWalking provides several runtime forms and probes.
+ Topology, Metrics and Trace Together. The first step to see and understand a distributed system should be from topology map. It visualizes the whole complex system as an easy map." />
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+ Keep Observability. No matter how does the target system deploy, SkyWalking could provide a solution or integration way to keep observability for it. Based on this, SkyWalking provides several runtime forms and probes.
+ Topology, Metrics and Trace Together. The first step to see and understand a distributed system should be from topology map. It visualizes the whole complex system as an easy map.">
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+ Keep Observability. No matter how does the target system deploy, SkyWalking could provide a solution or integration way to keep observability for it. Based on this, SkyWalking provides several runtime forms and probes.
+ Topology, Metrics and Trace Together. The first step to see and understand a distributed system should be from topology map. It visualizes the whole complex system as an easy map."/>
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+ <div class="row flex-xl-nowrap">
+ <div class="col-12 col-md-3 col-xl-2 d-print-none td-sidebar">
+
+
+
+ <h5>Documentation: v8.2.0</h5>
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/readme">Welcome</a>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/concepts-and-designs/readme">Concepts and Designs</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div >What is SkyWalking?</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/overview">Overview and Core concepts</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/project-goals">Project Goals</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Probe</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/probe-introduction">Introduction</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/service-agent">Service auto instrument agent</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/manual-sdk">Manual instrument SDK</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/service-mesh-probe">Service Mesh probe</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Backend</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/backend-overview">Overview</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/oal">Observability Analysis Language</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/protocols/readme#query-protocol">Query in OAP</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >UI</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/concepts-and-designs/ui-overview">Overview</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/readme">Setup</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div >Language agents in Service</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/readme#language-agents-in-service">Agents</a>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme">Java agent</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/Supported-list">Supported middleware, framework and library</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#table-of-agent-configuration-properties">Agent Configuration Properties</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#optional-plugins">Optional plugins</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#bootstrap-class-plugins">Bootstrap/JVM class plugin</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#advanced-reporters">Advanced reporters</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#plugin-development-guide">Plugin development guide</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/service-agent/java-agent/readme#plugin-development-guide">Agent plugin tests and performance tests</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/readme#language-agents-in-service">Other language agents</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div >Service Mesh</div>
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/istio/readme">SkyWalking on Istio</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/envoy/als_setting/">ALS (access log service)</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/backend/backend-ui-setup">Backend, UI and CLI setup document</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/setup/backend/backend-setup">Backend setup document</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/configuration-vocabulary">Configuration Vocabulary</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-setting-override">Overriding settings</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-ip-port">IP and port setting</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-init-mode">Backend init mode startup</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-cluster">Cluster management</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-k8s">Deploy in kubernetes</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-storage">Choose storage</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-receivers">Set receivers</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-fetcher">Open fetchers</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/trace-sampling">Trace sampling</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/slow-db-statement">Slow DB statement threshold</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/backend-oal-scripts">OAL scripts</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/backend-alarm">Alarm</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/advanced-deployment">Advanced deployment options</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/metrics-exporter">Metrics exporter</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/ttl">Time To Live (TTL)</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/dynamic-config">Dynamic Configuration</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/uninstrumented-gateways">Uninstrumented Gateways</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/setup/backend/ui-setup">UI setup document</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="https://github.com/apache/skywalking-cli">CLI setup document</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/ui/readme">UI Introduction</a>
+
+ </li>
+
+
+
+ <li>
+
+
+
+ <div ><a href="/docs/main/v8.2.0/en/guides/readme">Contributing Guides</a></div>
+
+
+
+ <ul class="">
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/readme#contact-us">Contact us</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/asf/committer">Process to become official Apache SkyWalking Committer</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/How-to-build">Compiling Guide</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/guides/Java-Plugin-Development-Guide">Agent plugin development guide</a>
+
+ </li>
+
+
+</ul>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/protocols/readme">Protocols</a>
+
+ </li>
+
+
+
+ <li>
+
+ <a href="/docs/main/v8.2.0/en/FAQ/readme">FAQs</a>
+
+ </li>
+
+
+</ul>
+ <div class="commit-id">Commit Id: af02b66</div>
+
+
+</div>
+ <div id="toc" class="d-none d-xl-block col-xl-2 td-toc d-print-none">
+
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+ <main class="col-12 col-md-9 col-xl-8 pl-md-5 pr-md-4" role="main">
+ <br>
+
+<div class="td-content">
+
+
+
+
+
+
+
+
+
+
+
+ <h1 id="design-goals">Design Goals</h1>
+<p>The document outlines the core design goals for SkyWalking project.</p>
+<ul>
+<li>
+<p><strong>Keep Observability</strong>. No matter how does the target system deploy, SkyWalking could provide a solution or
+integration way to keep observability for it. Based on this, SkyWalking provides several runtime forms and probes.</p>
+</li>
+<li>
+<p><strong>Topology, Metrics and Trace Together</strong>. The first step to see and understand a distributed system should be
+from topology map. It visualizes the whole complex system as an easy map. Under that topology, OSS people requires
+more about metrics for service, instance, endpoint and calls. Trace exists as detail logs for making sense of those metrics.
+Such as when endpoint latency becomes long, you want to see the slowest the trace to find out why. So you can see,
+they are from big picture to details, they are all needed. SkyWalking integrates and provides a lot of features to
+make this possible and easy understand.</p>
+</li>
+<li>
+<p><strong>Light Weight</strong>. There two parts of light weight are needed. (1) In probe, we just depend on network
+communication framework, prefer gRPC. By that, the probe should be as small as possible, to avoid the library
+conflicts and the payload of VM, such as permsize requirement in JVM.
+(2) As an observability platform, it is secondary and third level system in your project environment.
+So we are using our own light weight framework to build the backend core. Then you don’t need to
+deploy big data tech platform and maintain them. SkyWalking should be simple in tech stack.</p>
+</li>
+<li>
+<p><strong>Pluggable</strong>. SkyWalking core team provides many default implementations, but definitely it is not enough,
+and also don’t fit every scenario. So, we provide a lot of features for being pluggable.</p>
+</li>
+<li>
+<p><strong>Portability</strong>. SkyWalking can run in multiple environments, including:
+(1) Use traditional register center like eureka.
+(2) Use RPC framework including service discovery, like Spring Cloud, Apache Dubbo.
+(3) Use Service Mesh in modern infrastructure.
+(4) Use cloud services.
+(5) Across cloud deployment.
+SkyWalking should run well in all these cases.</p>
+</li>
+<li>
+<p><strong>Interop</strong>. Observability is a big landscape, SkyWalking is impossible to support all, even by its community.
+As that, it supports to interop with other OSS system, mostly probes, such as Zipkin, Jaeger, OpenTracing, OpenCensus.
+To accept and understand their data formats makes sure SkyWalking more useful for end users. And don’t require
+the users to switch their libraries.</p>
+</li>
+</ul>
+<h2 id="what-is-next">What is next?</h2>
+<ul>
+<li>See <a href="../probe-introduction">probe Introduction</a> to know SkyWalking’s probe groups.</li>
+<li>From <a href="../backend-overview">backend overview</a>, you can understand what backend does after it received probe data.</li>
+<li>If you want to customize UI, start with <a href="../ui-overview">UI overview</a> document.</li>
+</ul>
+
+
+
+
+</div>
+
+
+ </main>
+ </div>
+ </div>
+
+
+<footer class="bg-dark py-5 sky-row">
+ <div class="container-fluid text-center">
+ <div class="">
+
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+<ul class="list-inline mb-0">
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+ <li class="list-inline-item mx-2 h3" data-toggle="tooltip" data-placement="top" title="Twitter" aria-label="Twitter">
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+
+ <li class="list-inline-item mx-2 h3" data-toggle="tooltip" data-placement="top" title="GitHub" aria-label="GitHub">
+ <a class="text-white" target="_blank" href="https://github.com/apache/skywalking">
+ <i class="fab fa-github"></i>
+ </a>
+ </li>
+
+</ul>
+
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+
+ </div>
+ <div class="">
+
+ <small class="text-white">© 2021 The Apache Software Foundation All Rights Reserved</small>
+
+
+ </div>
+ <div class="">
+ <small class="text-white mt-4">Apache SkyWalking, SkyWalking, Apache, the Apache feather logo, and the Apache SkyWalking project logo are either registered trademarks or trademarks of the Apache Software Foundation.</small>
+ </div>
+ </div>
+</footer>
+
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+ <div class="nav-item"><a href="/docs/" class="nav-link">Projects and Documentation</a></div>
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