Reduce OpenTelemetry metric volume (#1603)

Attempt to reduce GCP cost of metrics exported by:
- Removing per-endpoint gRPC metrics
- Increasing period reader interval (not sure this will have the desired
effect but will verify in autopush)

Also, re-generate proto using the same protoc version as the rest of the
repo.

Author: hqpho

cmd/main.go

@@ -52,7 +52,6 @@ import (
 	"google.golang.org/grpc/health/grpc_health_v1"
 
 	cbt "cloud.google.com/go/bigtable"
-	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
 )
 
 var (
@@ -165,8 +164,6 @@ func main() {
 
 	// Create grpc server.
 	srv := grpc.NewServer(
-		// Set up gRPC middleware for per-method gRPC metrics
-		grpc.StatsHandler(otelgrpc.NewServerHandler()),
 		grpc.ChainUnaryInterceptor(
 			metrics.InjectMethodNameUnaryInterceptor,
 		),

internal/metrics/metrics.go

@@ -237,7 +237,8 @@ func ExportOtlpOverGrpc(ctx context.Context) error {
 		return err
 	}
 
-	mp := sdk.NewMeterProvider(sdk.WithReader(sdk.NewPeriodicReader(exporter)))
+	reader := sdk.NewPeriodicReader(exporter, sdk.WithInterval(10*time.Minute))
+	mp := sdk.NewMeterProvider(sdk.WithReader(reader))
 	otel.SetMeterProvider(mp)
 	return nil
 }