func (h *ServerStatsHandler) TagConn(ctx context.Context, info *stats.ConnTagInfo) context.Context {
	return ctx
}
TagConn adds connection related data to the given context and returns the
new context.
package grpcstats
import (
	"fmt"
	"sync/atomic"
	"time"
	"golang.org/x/net/context"
	istats "go.opencensus.io/stats"
	"go.opencensus.io/tag"
	"google.golang.org/grpc/grpclog"
	"google.golang.org/grpc/stats"
	"google.golang.org/grpc/status"
)
type ServerStatsHandler struct{}
var _ stats.Handler = &ServerStatsHandler{}
func NewServerStatsHandler() *ServerStatsHandler {
	return &ServerStatsHandler{}
}