[OTel] Set prometheus exporter option to populate otel scope (#38170)

Fix #38169

Closes #38170

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/38170 from yashykt:OpenTelMetricsOptions 8ea4ed82ed
PiperOrigin-RevId: 698849889

examples/cpp/csm/csm_greeter_client.cc

@@ -161,6 +161,7 @@ absl::StatusOr<grpc::CsmObservability> InitializeObservability() {
   opentelemetry::exporter::metrics::PrometheusExporterOptions opts;
   // default was "localhost:9464" which causes connection issue across GKE pods
   opts.url = "0.0.0.0:9464";
+  opts.without_otel_scope = false;
   auto prometheus_exporter =
       opentelemetry::exporter::metrics::PrometheusExporterFactory::Create(opts);
   auto meter_provider =

examples/cpp/csm/csm_greeter_server.cc

@@ -103,6 +103,7 @@ int main(int argc, char** argv) {
   opentelemetry::exporter::metrics::PrometheusExporterOptions opts;
   // default was "localhost:9464" which causes connection issue across GKE pods
   opts.url = "0.0.0.0:9464";
+  opts.without_otel_scope = false;
   auto prometheus_exporter =
       opentelemetry::exporter::metrics::PrometheusExporterFactory::Create(opts);
   auto meter_provider =

examples/cpp/csm/observability/csm_greeter_client.cc

@@ -45,6 +45,7 @@ absl::StatusOr<grpc::CsmObservability> InitializeObservability() {
   opentelemetry::exporter::metrics::PrometheusExporterOptions opts;
   // default was "localhost:9464" which causes connection issue across GKE pods
   opts.url = "0.0.0.0:9464";
+  opts.without_otel_scope = false;
   auto prometheus_exporter =
       opentelemetry::exporter::metrics::PrometheusExporterFactory::Create(opts);
   auto meter_provider =

examples/cpp/csm/observability/csm_greeter_server.cc

@@ -50,6 +50,7 @@ int main(int argc, char** argv) {
   opentelemetry::exporter::metrics::PrometheusExporterOptions opts;
   // default was "localhost:9464" which causes connection issue across GKE pods
   opts.url = "0.0.0.0:9464";
+  opts.without_otel_scope = false;
   auto prometheus_exporter =
       opentelemetry::exporter::metrics::PrometheusExporterFactory::Create(opts);
   auto meter_provider =

examples/cpp/otel/greeter_callback_client.cc

@@ -49,6 +49,7 @@ int main(int argc, char** argv) {
   // exporter.
   opentelemetry::exporter::metrics::PrometheusExporterOptions opts;
   opts.url = absl::GetFlag(FLAGS_prometheus_endpoint);
+  opts.without_otel_scope = false;
   auto prometheus_exporter =
       opentelemetry::exporter::metrics::PrometheusExporterFactory::Create(opts);
   auto meter_provider =

examples/cpp/otel/greeter_callback_server.cc

@@ -52,6 +52,7 @@ int main(int argc, char** argv) {
   // exporter.
   opentelemetry::exporter::metrics::PrometheusExporterOptions opts;
   opts.url = absl::GetFlag(FLAGS_prometheus_endpoint);
+  opts.without_otel_scope = false;
   auto prometheus_exporter =
       opentelemetry::exporter::metrics::PrometheusExporterFactory::Create(opts);
   auto meter_provider =

test/cpp/interop/xds_interop_client.cc

@@ -430,6 +430,7 @@ grpc::CsmObservability EnableCsmObservability() {
   // default was "localhost:9464" which causes connection issue across GKE
   // pods
   opts.url = "0.0.0.0:9464";
+  opts.without_otel_scope = false;
   auto prometheus_exporter =
       opentelemetry::exporter::metrics::PrometheusExporterFactory::Create(opts);
   auto meter_provider =

test/cpp/interop/xds_interop_server.cc

@@ -49,6 +49,7 @@ grpc::CsmObservability EnableCsmObservability() {
   // default was "localhost:9464" which causes connection issue across GKE
   // pods
   opts.url = "0.0.0.0:9464";
+  opts.without_otel_scope = false;
   auto prometheus_exporter =
       opentelemetry::exporter::metrics::PrometheusExporterFactory::Create(opts);
   auto meter_provider =