[incubator-skywalking] branch document/advanced updated: Provide direct uplink doc.

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The following commit(s) were added to refs/heads/document/advanced by this push:
     new f6215b3  Provide direct uplink doc.
f6215b3 is described below

commit f6215b333e0bb36b14fa187193cd5d44b6a34eb4
Author: wu-sheng <wu...@foxmail.com>
AuthorDate: Mon Apr 2 10:45:27 2018 +0800

    Provide direct uplink doc.
---
 docs/en/direct-uplink.md | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/docs/en/direct-uplink.md b/docs/en/direct-uplink.md
index e69de29..d82220f 100644
--- a/docs/en/direct-uplink.md
+++ b/docs/en/direct-uplink.md
@@ -0,0 +1,29 @@
+# Direct uplink
+## What is direct uplink?
+In default, SkyWalking agent uses naming service to find all collector addresses. Then connect to gRPC services.
+
+In **direct updalink**, mean no naming service available or don't work well, set the gRPC addresses in agent directly. 
+The agent uses theses addresses to connect gRPC services.
+
+## Why need this?
+Agent uplink data through the following network
+1. VPCs in Cloud
+1. Internet
+1. Different subnet.
+1. IPs and Ports proxy
+
+## Set the agent config
+1. Remove `collector.servers` config item.
+2. You can find the following settings in `agent.config`
+```
+# Collector agent_gRPC/grpc service addresses.
+# Secondary address setting, only effect when "collector.servers" is empty.
+# By using this, no discovery mechanism provided. The agent only uses these addresses to uplink data.
+# Recommend to use this only when collector cluster IPs are unreachable from agent side. Such as:
+#   1. Agent and collector cluster are in different VPC in Cloud.
+#   2. Agent uplinks data to collector cluster through Internet.
+# collector.direct_servers=www.skywalking.service.io
+```  
+
+3. Set `collector.direct_servers` to a domain name, IP:PORTs, with split by comma(,).
+

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