Code:play 

package main

import (
	"log"

	ocgrpc "go.opencensus.io/plugin/grpc"
	"go.opencensus.io/plugin/grpc/grpcstats"
	"google.golang.org/grpc"
)

func main() {
	// Subscribe to collect client request count.
	if err := grpcstats.RPCClientRequestCountView.Subscribe(); err != nil {
		log.Fatal(err)
	}

	// Set up a connection to the server with the OpenCensus
	// stats handler to enable stats and tracing.
	conn, err := grpc.Dial("address", grpc.WithStatsHandler(ocgrpc.NewClientStatsHandler()))
	if err != nil {
		log.Fatalf("did not connect: %v", err)
	}
	defer conn.Close()
}

Code:play 

package main

import (
	"log"

	ocgrpc "go.opencensus.io/plugin/grpc"
	"go.opencensus.io/plugin/grpc/grpcstats"
	"google.golang.org/grpc"
)

func main() {
	// Subscribe to collect server request count.
	if err := grpcstats.RPCServerRequestCountView.Subscribe(); err != nil {
		log.Fatal(err)
	}

	// Set up a new server with the OpenCensus
	// stats handler to enable stats and tracing.
	s := grpc.NewServer(grpc.StatsHandler(ocgrpc.NewServerStatsHandler()))
	_ = s // use s
}