Use otelgrpc for tracing grpc server and client (#15237)

* Use otelgrpc for tracing grpc server and client.

* Changelog fragment

* gofmt

* Use context in prometheus service

* Remove async start of prometheus service

* Use random port to reduce the probability of concurrent tests using the same port

* Remove comment

* fix lint error

---------

Co-authored-by: Bastin <bastin.m@proton.me>

validator/client/BUILD.bazel

@@ -84,7 +84,7 @@ go_library(
         "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",
         "@com_github_prysmaticlabs_go_bitfield//:go_default_library",
         "@com_github_sirupsen_logrus//:go_default_library",
-        "@io_opencensus_go//plugin/ocgrpc:go_default_library",
+        "@io_opentelemetry_go_contrib_instrumentation_google_golang_org_grpc_otelgrpc//:go_default_library",
         "@io_opentelemetry_go_contrib_instrumentation_net_http_otelhttp//:go_default_library",
         "@io_opentelemetry_go_otel_trace//:go_default_library",
         "@org_golang_google_grpc//:go_default_library",

validator/client/service.go

@@ -32,7 +32,7 @@ import (
 	grpcopentracing "github.com/grpc-ecosystem/go-grpc-middleware/tracing/opentracing"
 	grpcprometheus "github.com/grpc-ecosystem/go-grpc-prometheus"
 	"github.com/pkg/errors"
-	"go.opencensus.io/plugin/ocgrpc"
+	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
 	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
@@ -314,7 +314,7 @@ func ConstructDialOptions(
 			grpcretry.WithMax(grpcRetries),
 			grpcretry.WithBackoff(grpcretry.BackoffLinear(grpcRetryDelay)),
 		),
-		grpc.WithStatsHandler(&ocgrpc.ClientHandler{}),
+		grpc.WithStatsHandler(otelgrpc.NewClientHandler()),
 		grpc.WithUnaryInterceptor(middleware.ChainUnaryClient(
 			grpcopentracing.UnaryClientInterceptor(),
 			grpcprometheus.UnaryClientInterceptor,

validator/node/node.go

@@ -376,6 +376,7 @@ func (c *ValidatorClient) registerPrometheusService(cliCtx *cli.Context) error {
 		return nil
 	}
 	service := prometheus.NewService(
+		cliCtx.Context,
 		fmt.Sprintf("%s:%d", cliCtx.String(cmd.MonitoringHostFlag.Name), cliCtx.Int(flags.MonitoringPortFlag.Name)),
 		c.services,
 	)