gRPC Statistics

This is a filter which enables telemetry of gRPC calls. Additionally, the filter detects message boundaries in streaming gRPC calls and emits the message counts for both the request and the response.

More info: wire format in gRPC over HTTP/2.

The filter emits statistics in the cluster.<route target cluster>.grpc. namespace. Depending on the configuration, the stats may be prefixed with <grpc service>.<grpc method>.; the stats in the table below are shown in this form. See the documentation for and stats_for_all_methods.