GCP Observability: Client attempt top latency (#32064)

include/grpcpp/opencensus.h

@@ -76,6 +76,7 @@ extern const absl::string_view kRpcServerStartedRpcsMeasureName;
 // Canonical gRPC view definitions.
 const ::opencensus::stats::ViewDescriptor& ClientStartedRpcs();
 const ::opencensus::stats::ViewDescriptor& ClientCompletedRpcs();
+const ::opencensus::stats::ViewDescriptor& ClientRoundtripLatency();
 const ::opencensus::stats::ViewDescriptor&
 ClientSentCompressedMessageBytesPerRpc();
 const ::opencensus::stats::ViewDescriptor&

src/cpp/ext/filters/census/views.cc

@@ -110,6 +110,16 @@ const ViewDescriptor& ClientCompletedRpcs() {
   return descriptor;
 }
 
+const ViewDescriptor& ClientRoundtripLatency() {
+  const static ViewDescriptor descriptor =
+      ViewDescriptor()
+          .set_name("grpc.io/client/roundtrip_latency")
+          .set_measure(kRpcClientRoundtripLatencyMeasureName)
+          .set_aggregation(MillisDistributionAggregation())
+          .add_column(ClientMethodTagKey());
+  return descriptor;
+}
+
 const ViewDescriptor& ClientSentCompressedMessageBytesPerRpc() {
   const static ViewDescriptor descriptor =
       ViewDescriptor()

src/cpp/ext/gcp/observability.cc

@@ -61,6 +61,7 @@ void RegisterOpenCensusViewsForGcpObservability() {
   // Register client default views for GCP observability
   ClientStartedRpcs().RegisterForExport();
   ClientCompletedRpcs().RegisterForExport();
+  ClientRoundtripLatency().RegisterForExport();
   ClientSentCompressedMessageBytesPerRpc().RegisterForExport();
   ClientReceivedCompressedMessageBytesPerRpc().RegisterForExport();
   // Register server default views for GCP observability