[GitHub] [incubator-skywalking] wu-sheng opened a new pull request #2395: Support gRPC metric exporter

[GitBox <gi...@apache.org>]

wu-sheng opened a new pull request #2395: Support gRPC metric exporter
URL: https://github.com/apache/incubator-skywalking/pull/2395
 
 
   Hi, this PR introduce the first metric exporter implementation to the core. I write the gRPC exporter.
   
   The following document has been included in this PR too.
   
   # Metric Exporter
   SkyWalking provides basic and most important metric aggregation, alarm and analysis. 
   In real world, people may want to forward the data to their 3rd party system, for deeper analysis or anything else.
   **Metric Exporter** makes that possible.
   
   Metric exporter is an independent module, you need manually active it.
   
   Right now, we provide the following exporters
   1. gRPC exporter
   
   ## gRPC exporter
   gRPC exporter uses SkyWalking native exporter service definition. Here is proto definition.
   ```proto
   service MetricExportService {
       rpc export (stream ExportMetricValue) returns (ExportResponse) {
       }
   }
   
   message ExportMetricValue {
       string metricName = 1;
       string entityName = 2;
       string entityId = 3;
       ValueType type = 5;
       int64 timeBucket = 6;
       int64 longValue = 7;
       double doubleValue = 8;
   }
   
   enum ValueType {
       LONG = 0;
       DOUBLE = 1;
   }
   
   message ExportResponse {
   }
   ```
   
   To active the exporter, you should add this into your `application.yml`
   ```yaml
   exporter:
     grpc:
       targetHost: 127.0.0.1
       targetPort: 9870
   ```
   
   `targetHost`:`targetPort` is the expected target service address. You could set any gRPC server to receive the data.

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