Allow set sts as call credential for opencensus tracer stub (#9877)

Signed-off-by: Pengyuan Bian <bianpengyuan@google.com>

Mirrored from https://github.com/envoyproxy/envoy @ 8f174ab84d21c36a927f7adf2f7c1e4d4ad20122

envoy/config/trace/v2/trace.proto

@@ -142,7 +142,7 @@ message DatadogConfig {
 }
 
 // Configuration for the OpenCensus tracer.
-// [#next-free-field: 13]
+// [#next-free-field: 14]
 // [#extension: envoy.tracers.opencensus]
 message OpenCensusConfig {
   enum TraceContext {
@@ -184,6 +184,11 @@ message OpenCensusConfig {
   // https://github.com/grpc/grpc/blob/master/doc/naming.md
   string stackdriver_address = 10;
 
+  // (optional) The gRPC server that hosts Stackdriver tracing service. Only
+  // Google gRPC is supported. If :ref:`target_uri <envoy_v3_api_field_config.core.v3.GrpcService.GoogleGrpc.target_uri>`
+  // is not provided, the default production Stackdriver address will be used.
+  api.v2.core.GrpcService stackdriver_grpc_service = 13;
+
   // Enables the Zipkin exporter if set to true. The url and service name must
   // also be set.
   bool zipkin_exporter_enabled = 5;

envoy/config/trace/v3/trace.proto

@@ -162,7 +162,7 @@ message DatadogConfig {
 }
 
 // Configuration for the OpenCensus tracer.
-// [#next-free-field: 13]
+// [#next-free-field: 14]
 // [#extension: envoy.tracers.opencensus]
 message OpenCensusConfig {
   option (udpa.annotations.versioning).previous_message_type =
@@ -207,6 +207,11 @@ message OpenCensusConfig {
   // https://github.com/grpc/grpc/blob/master/doc/naming.md
   string stackdriver_address = 10;
 
+  // (optional) The gRPC server that hosts Stackdriver tracing service. Only
+  // Google gRPC is supported. If :ref:`target_uri <envoy_v3_api_field_config.core.v3.GrpcService.GoogleGrpc.target_uri>`
+  // is not provided, the default production Stackdriver address will be used.
+  core.v3.GrpcService stackdriver_grpc_service = 13;
+
   // Enables the Zipkin exporter if set to true. The url and service name must
   // also be set.
   bool zipkin_exporter_enabled = 5;