wu-sheng commented on issue #2395: Support gRPC metric exporter URL: https://github.com/apache/incubator-skywalking/pull/2395#issuecomment-475886142 I do add a new metric in gRPC exporter definition. ```proto service MetricExportService { rpc export (stream ExportMetricValue) returns (ExportResponse) { } rpc subscription (SubscriptionReq) returns (SubscriptionsResp) { } } message ExportMetricValue { string metricName = 1; string entityName = 2; string entityId = 3; ValueType type = 4; int64 timeBucket = 5; int64 longValue = 6; double doubleValue = 7; } message SubscriptionsResp { repeated string metricNames = 1; } ``` When exporter starts, it will use `#subscription` to get the metric name list. If empty, then export all metrics. If you don't want export, you should simply remove this module. Also, since this is a config downstream service, it require the target gRPC standby because OAP start up, otherwise, it starts up failure. Document updated too.
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