diff --git a/go.mod b/go.mod
index 6c7e555ed..c438b8886 100644
--- a/go.mod
+++ b/go.mod
@@ -26,7 +26,7 @@ require (
 	github.com/stretchr/testify v1.8.0
 	golang.org/x/crypto v0.0.0-20220214200702-86341886e292
 	golang.org/x/sys v0.0.0-20220209214540-3681064d5158
-	google.golang.org/grpc v1.47.0
+	google.golang.org/grpc v1.48.0
 	google.golang.org/protobuf v1.28.0
 	k8s.io/api v0.24.2
 	k8s.io/apimachinery v0.24.2
diff --git a/go.sum b/go.sum
index 9fd8fca2c..9878ef466 100644
--- a/go.sum
+++ b/go.sum
@@ -1674,8 +1674,8 @@ google.golang.org/grpc v1.37.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQ
 google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
 google.golang.org/grpc v1.40.0/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
 google.golang.org/grpc v1.41.0/go.mod h1:U3l9uK9J0sini8mHphKoXyaqDA/8VyGnDee1zzIUK6k=
-google.golang.org/grpc v1.47.0 h1:9n77onPX5F3qfFCqjy9dhn8PbNQsIKeVU04J9G7umt8=
-google.golang.org/grpc v1.47.0/go.mod h1:vN9eftEi1UMyUsIF80+uQXhHjbXYbm0uXoFCACuMGWk=
+google.golang.org/grpc v1.48.0 h1:rQOsyJ/8+ufEDJd/Gdsz7HG220Mh9HAhFHRGnIjda0w=
+google.golang.org/grpc v1.48.0/go.mod h1:vN9eftEi1UMyUsIF80+uQXhHjbXYbm0uXoFCACuMGWk=
 google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
diff --git a/vendor/google.golang.org/grpc/balancer/base/balancer.go b/vendor/google.golang.org/grpc/balancer/base/balancer.go
index a67074a3a..e8dfc828a 100644
--- a/vendor/google.golang.org/grpc/balancer/base/balancer.go
+++ b/vendor/google.golang.org/grpc/balancer/base/balancer.go
@@ -45,6 +45,7 @@ func (bb *baseBuilder) Build(cc balancer.ClientConn, opt balancer.BuildOptions)
 		scStates: make(map[balancer.SubConn]connectivity.State),
 		csEvltr:  &balancer.ConnectivityStateEvaluator{},
 		config:   bb.config,
+		state:    connectivity.Connecting,
 	}
 	// Initialize picker to a picker that always returns
 	// ErrNoSubConnAvailable, because when state of a SubConn changes, we
@@ -134,6 +135,9 @@ func (b *baseBalancer) UpdateClientConnState(s balancer.ClientConnState) error {
 		b.ResolverError(errors.New("produced zero addresses"))
 		return balancer.ErrBadResolverState
 	}
+
+	b.regeneratePicker()
+	b.cc.UpdateState(balancer.State{ConnectivityState: b.state, Picker: b.picker})
 	return nil
 }
 
diff --git a/vendor/google.golang.org/grpc/clientconn.go b/vendor/google.golang.org/grpc/clientconn.go
index de6d41c23..0d21f2210 100644
--- a/vendor/google.golang.org/grpc/clientconn.go
+++ b/vendor/google.golang.org/grpc/clientconn.go
@@ -146,6 +146,10 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 	cc.safeConfigSelector.UpdateConfigSelector(&defaultConfigSelector{nil})
 	cc.ctx, cc.cancel = context.WithCancel(context.Background())
 
+	for _, opt := range extraDialOptions {
+		opt.apply(&cc.dopts)
+	}
+
 	for _, opt := range opts {
 		opt.apply(&cc.dopts)
 	}
diff --git a/vendor/google.golang.org/grpc/dialoptions.go b/vendor/google.golang.org/grpc/dialoptions.go
index f2f605a17..75d01ba77 100644
--- a/vendor/google.golang.org/grpc/dialoptions.go
+++ b/vendor/google.golang.org/grpc/dialoptions.go
@@ -35,6 +35,15 @@ import (
 	"google.golang.org/grpc/stats"
 )
 
+func init() {
+	internal.AddExtraDialOptions = func(opt ...DialOption) {
+		extraDialOptions = append(extraDialOptions, opt...)
+	}
+	internal.ClearExtraDialOptions = func() {
+		extraDialOptions = nil
+	}
+}
+
 // dialOptions configure a Dial call. dialOptions are set by the DialOption
 // values passed to Dial.
 type dialOptions struct {
@@ -70,6 +79,8 @@ type DialOption interface {
 	apply(*dialOptions)
 }
 
+var extraDialOptions []DialOption
+
 // EmptyDialOption does not alter the dial configuration. It can be embedded in
 // another structure to build custom dial options.
 //
@@ -380,7 +391,7 @@ func WithDialer(f func(string, time.Duration) (net.Conn, error)) DialOption {
 // all the RPCs and underlying network connections in this ClientConn.
 func WithStatsHandler(h stats.Handler) DialOption {
 	return newFuncDialOption(func(o *dialOptions) {
-		o.copts.StatsHandler = h
+		o.copts.StatsHandlers = append(o.copts.StatsHandlers, h)
 	})
 }
 
diff --git a/vendor/google.golang.org/grpc/internal/balancer/gracefulswitch/gracefulswitch.go b/vendor/google.golang.org/grpc/internal/balancer/gracefulswitch/gracefulswitch.go
index 7ba8f4d18..08666f62a 100644
--- a/vendor/google.golang.org/grpc/internal/balancer/gracefulswitch/gracefulswitch.go
+++ b/vendor/google.golang.org/grpc/internal/balancer/gracefulswitch/gracefulswitch.go
@@ -193,6 +193,8 @@ func (gsb *Balancer) ExitIdle() {
 		ei.ExitIdle()
 		return
 	}
+	gsb.mu.Lock()
+	defer gsb.mu.Unlock()
 	for sc := range balToUpdate.subconns {
 		sc.Connect()
 	}
diff --git a/vendor/google.golang.org/grpc/internal/binarylog/binarylog.go b/vendor/google.golang.org/grpc/internal/binarylog/binarylog.go
index 0a25ce43f..e3dfe204f 100644
--- a/vendor/google.golang.org/grpc/internal/binarylog/binarylog.go
+++ b/vendor/google.golang.org/grpc/internal/binarylog/binarylog.go
@@ -42,14 +42,14 @@ var binLogger Logger
 
 var grpclogLogger = grpclog.Component("binarylog")
 
-// SetLogger sets the binarg logger.
+// SetLogger sets the binary logger.
 //
 // Only call this at init time.
 func SetLogger(l Logger) {
 	binLogger = l
 }
 
-// GetLogger gets the binarg logger.
+// GetLogger gets the binary logger.
 //
 // Only call this at init time.
 func GetLogger() Logger {
diff --git a/vendor/google.golang.org/grpc/internal/envconfig/xds.go b/vendor/google.golang.org/grpc/internal/envconfig/xds.go
index 7d996e51b..55aaeea8b 100644
--- a/vendor/google.golang.org/grpc/internal/envconfig/xds.go
+++ b/vendor/google.golang.org/grpc/internal/envconfig/xds.go
@@ -77,7 +77,7 @@ var (
 	// environment variable
 	// "GRPC_XDS_EXPERIMENTAL_ENABLE_AGGREGATE_AND_LOGICAL_DNS_CLUSTER" to
 	// "true".
-	XDSAggregateAndDNS = strings.EqualFold(os.Getenv(aggregateAndDNSSupportEnv), "true")
+	XDSAggregateAndDNS = !strings.EqualFold(os.Getenv(aggregateAndDNSSupportEnv), "false")
 
 	// XDSRBAC indicates whether xDS configured RBAC HTTP Filter is enabled,
 	// which can be disabled by setting the environment variable
diff --git a/vendor/google.golang.org/grpc/internal/internal.go b/vendor/google.golang.org/grpc/internal/internal.go
index 6d355b0b0..83018be7c 100644
--- a/vendor/google.golang.org/grpc/internal/internal.go
+++ b/vendor/google.golang.org/grpc/internal/internal.go
@@ -63,6 +63,76 @@ var (
 	// xDS-enabled server invokes this method on a grpc.Server when a particular
 	// listener moves to "not-serving" mode.
 	DrainServerTransports interface{} // func(*grpc.Server, string)
+	// AddExtraServerOptions adds an array of ServerOption that will be
+	// effective globally for newly created servers. The priority will be: 1.
+	// user-provided; 2. this method; 3. default values.
+	AddExtraServerOptions interface{} // func(opt ...ServerOption)
+	// ClearExtraServerOptions clears the array of extra ServerOption. This
+	// method is useful in testing and benchmarking.
+	ClearExtraServerOptions func()
+	// AddExtraDialOptions adds an array of DialOption that will be effective
+	// globally for newly created client channels. The priority will be: 1.
+	// user-provided; 2. this method; 3. default values.
+	AddExtraDialOptions interface{} // func(opt ...DialOption)
+	// ClearExtraDialOptions clears the array of extra DialOption. This
+	// method is useful in testing and benchmarking.
+	ClearExtraDialOptions func()
+
+	// NewXDSResolverWithConfigForTesting creates a new xds resolver builder using
+	// the provided xds bootstrap config instead of the global configuration from
+	// the supported environment variables.  The resolver.Builder is meant to be
+	// used in conjunction with the grpc.WithResolvers DialOption.
+	//
+	// Testing Only
+	//
+	// This function should ONLY be used for testing and may not work with some
+	// other features, including the CSDS service.
+	NewXDSResolverWithConfigForTesting interface{} // func([]byte) (resolver.Builder, error)
+
+	// RegisterRLSClusterSpecifierPluginForTesting registers the RLS Cluster
+	// Specifier Plugin for testing purposes, regardless of the XDSRLS environment
+	// variable.
+	//
+	// TODO: Remove this function once the RLS env var is removed.
+	RegisterRLSClusterSpecifierPluginForTesting func()
+
+	// UnregisterRLSClusterSpecifierPluginForTesting unregisters the RLS Cluster
+	// Specifier Plugin for testing purposes. This is needed because there is no way
+	// to unregister the RLS Cluster Specifier Plugin after registering it solely
+	// for testing purposes using RegisterRLSClusterSpecifierPluginForTesting().
+	//
+	// TODO: Remove this function once the RLS env var is removed.
+	UnregisterRLSClusterSpecifierPluginForTesting func()
+
+	// RegisterRBACHTTPFilterForTesting registers the RBAC HTTP Filter for testing
+	// purposes, regardless of the RBAC environment variable.
+	//
+	// TODO: Remove this function once the RBAC env var is removed.
+	RegisterRBACHTTPFilterForTesting func()
+
+	// UnregisterRBACHTTPFilterForTesting unregisters the RBAC HTTP Filter for
+	// testing purposes. This is needed because there is no way to unregister the
+	// HTTP Filter after registering it solely for testing purposes using
+	// RegisterRBACHTTPFilterForTesting().
+	//
+	// TODO: Remove this function once the RBAC env var is removed.
+	UnregisterRBACHTTPFilterForTesting func()
+
+	// RegisterOutlierDetectionBalancerForTesting registers the Outlier
+	// Detection Balancer for testing purposes, regardless of the Outlier
+	// Detection environment variable.
+	//
+	// TODO: Remove this function once the Outlier Detection env var is removed.
+	RegisterOutlierDetectionBalancerForTesting func()
+
+	// UnregisterOutlierDetectionBalancerForTesting unregisters the Outlier
+	// Detection Balancer for testing purposes. This is needed because there is
+	// no way to unregister the Outlier Detection Balancer after registering it
+	// solely for testing purposes using
+	// RegisterOutlierDetectionBalancerForTesting().
+	//
+	// TODO: Remove this function once the Outlier Detection env var is removed.
+	UnregisterOutlierDetectionBalancerForTesting func()
 )
 
 // HealthChecker defines the signature of the client-side LB channel health checking function.
diff --git a/vendor/google.golang.org/grpc/internal/transport/handler_server.go b/vendor/google.golang.org/grpc/internal/transport/handler_server.go
index 1c3459c2b..090120925 100644
--- a/vendor/google.golang.org/grpc/internal/transport/handler_server.go
+++ b/vendor/google.golang.org/grpc/internal/transport/handler_server.go
@@ -49,7 +49,7 @@ import (
 // NewServerHandlerTransport returns a ServerTransport handling gRPC
 // from inside an http.Handler. It requires that the http Server
 // supports HTTP/2.
-func NewServerHandlerTransport(w http.ResponseWriter, r *http.Request, stats stats.Handler) (ServerTransport, error) {
+func NewServerHandlerTransport(w http.ResponseWriter, r *http.Request, stats []stats.Handler) (ServerTransport, error) {
 	if r.ProtoMajor != 2 {
 		return nil, errors.New("gRPC requires HTTP/2")
 	}
@@ -138,7 +138,7 @@ type serverHandlerTransport struct {
 	// TODO make sure this is consistent across handler_server and http2_server
 	contentSubtype string
 
-	stats stats.Handler
+	stats []stats.Handler
 }
 
 func (ht *serverHandlerTransport) Close() {
@@ -228,10 +228,10 @@ func (ht *serverHandlerTransport) WriteStatus(s *Stream, st *status.Status) erro
 	})
 
 	if err == nil { // transport has not been closed
-		if ht.stats != nil {
-			// Note: The trailer fields are compressed with hpack after this call returns.
-			// No WireLength field is set here.
-			ht.stats.HandleRPC(s.Context(), &stats.OutTrailer{
+		// Note: The trailer fields are compressed with hpack after this call returns.
+		// No WireLength field is set here.
+		for _, sh := range ht.stats {
+			sh.HandleRPC(s.Context(), &stats.OutTrailer{
 				Trailer: s.trailer.Copy(),
 			})
 		}
@@ -314,10 +314,10 @@ func (ht *serverHandlerTransport) WriteHeader(s *Stream, md metadata.MD) error {
 	})
 
 	if err == nil {
-		if ht.stats != nil {
+		for _, sh := range ht.stats {
 			// Note: The header fields are compressed with hpack after this call returns.
 			// No WireLength field is set here.
-			ht.stats.HandleRPC(s.Context(), &stats.OutHeader{
+			sh.HandleRPC(s.Context(), &stats.OutHeader{
 				Header:      md.Copy(),
 				Compression: s.sendCompress,
 			})
@@ -369,14 +369,14 @@ func (ht *serverHandlerTransport) HandleStreams(startStream func(*Stream), trace
 	}
 	ctx = metadata.NewIncomingContext(ctx, ht.headerMD)
 	s.ctx = peer.NewContext(ctx, pr)
-	if ht.stats != nil {
-		s.ctx = ht.stats.TagRPC(s.ctx, &stats.RPCTagInfo{FullMethodName: s.method})
+	for _, sh := range ht.stats {
+		s.ctx = sh.TagRPC(s.ctx, &stats.RPCTagInfo{FullMethodName: s.method})
 		inHeader := &stats.InHeader{
 			FullMethod:  s.method,
 			RemoteAddr:  ht.RemoteAddr(),
 			Compression: s.recvCompress,
 		}
-		ht.stats.HandleRPC(s.ctx, inHeader)
+		sh.HandleRPC(s.ctx, inHeader)
 	}
 	s.trReader = &transportReader{
 		reader:        &recvBufferReader{ctx: s.ctx, ctxDone: s.ctx.Done(), recv: s.buf, freeBuffer: func(*bytes.Buffer) {}},
diff --git a/vendor/google.golang.org/grpc/internal/transport/http2_client.go b/vendor/google.golang.org/grpc/internal/transport/http2_client.go
index 24ca59084..be371c6e0 100644
--- a/vendor/google.golang.org/grpc/internal/transport/http2_client.go
+++ b/vendor/google.golang.org/grpc/internal/transport/http2_client.go
@@ -90,7 +90,7 @@ type http2Client struct {
 	kp               keepalive.ClientParameters
 	keepaliveEnabled bool
 
-	statsHandler stats.Handler
+	statsHandlers []stats.Handler
 
 	initialWindowSize int32
 
@@ -311,7 +311,7 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 		isSecure:              isSecure,
 		perRPCCreds:           perRPCCreds,
 		kp:                    kp,
-		statsHandler:          opts.StatsHandler,
+		statsHandlers:         opts.StatsHandlers,
 		initialWindowSize:     initialWindowSize,
 		onPrefaceReceipt:      onPrefaceReceipt,
 		nextID:                1,
@@ -341,15 +341,15 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 			updateFlowControl: t.updateFlowControl,
 		}
 	}
-	if t.statsHandler != nil {
-		t.ctx = t.statsHandler.TagConn(t.ctx, &stats.ConnTagInfo{
+	for _, sh := range t.statsHandlers {
+		t.ctx = sh.TagConn(t.ctx, &stats.ConnTagInfo{
 			RemoteAddr: t.remoteAddr,
 			LocalAddr:  t.localAddr,
 		})
 		connBegin := &stats.ConnBegin{
 			Client: true,
 		}
-		t.statsHandler.HandleConn(t.ctx, connBegin)
+		sh.HandleConn(t.ctx, connBegin)
 	}
 	t.channelzID, err = channelz.RegisterNormalSocket(t, opts.ChannelzParentID, fmt.Sprintf("%s -> %s", t.localAddr, t.remoteAddr))
 	if err != nil {
@@ -773,24 +773,27 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (*Stream,
 			return nil, &NewStreamError{Err: ErrConnClosing, AllowTransparentRetry: true}
 		}
 	}
-	if t.statsHandler != nil {
+	if len(t.statsHandlers) != 0 {
 		header, ok := metadata.FromOutgoingContext(ctx)
 		if ok {
 			header.Set("user-agent", t.userAgent)
 		} else {
 			header = metadata.Pairs("user-agent", t.userAgent)
 		}
-		// Note: The header fields are compressed with hpack after this call returns.
-		// No WireLength field is set here.
-		outHeader := &stats.OutHeader{
-			Client:      true,
-			FullMethod:  callHdr.Method,
-			RemoteAddr:  t.remoteAddr,
-			LocalAddr:   t.localAddr,
-			Compression: callHdr.SendCompress,
-			Header:      header,
+		for _, sh := range t.statsHandlers {
+			// Note: The header fields are compressed with hpack after this call returns.
+			// No WireLength field is set here.
+			// Note: Creating a new stats object to prevent pollution.
+			outHeader := &stats.OutHeader{
+				Client:      true,
+				FullMethod:  callHdr.Method,
+				RemoteAddr:  t.remoteAddr,
+				LocalAddr:   t.localAddr,
+				Compression: callHdr.SendCompress,
+				Header:      header,
+			}
+			sh.HandleRPC(s.ctx, outHeader)
 		}
-		t.statsHandler.HandleRPC(s.ctx, outHeader)
 	}
 	return s, nil
 }
@@ -916,11 +919,11 @@ func (t *http2Client) Close(err error) {
 	for _, s := range streams {
 		t.closeStream(s, err, false, http2.ErrCodeNo, st, nil, false)
 	}
-	if t.statsHandler != nil {
+	for _, sh := range t.statsHandlers {
 		connEnd := &stats.ConnEnd{
 			Client: true,
 		}
-		t.statsHandler.HandleConn(t.ctx, connEnd)
+		sh.HandleConn(t.ctx, connEnd)
 	}
 }
 
@@ -1432,7 +1435,7 @@ func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
 		close(s.headerChan)
 	}
 
-	if t.statsHandler != nil {
+	for _, sh := range t.statsHandlers {
 		if isHeader {
 			inHeader := &stats.InHeader{
 				Client:      true,
@@ -1440,14 +1443,14 @@ func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
 				Header:      metadata.MD(mdata).Copy(),
 				Compression: s.recvCompress,
 			}
-			t.statsHandler.HandleRPC(s.ctx, inHeader)
+			sh.HandleRPC(s.ctx, inHeader)
 		} else {
 			inTrailer := &stats.InTrailer{
 				Client:     true,
 				WireLength: int(frame.Header().Length),
 				Trailer:    metadata.MD(mdata).Copy(),
 			}
-			t.statsHandler.HandleRPC(s.ctx, inTrailer)
+			sh.HandleRPC(s.ctx, inTrailer)
 		}
 	}
 
diff --git a/vendor/google.golang.org/grpc/internal/transport/http2_server.go b/vendor/google.golang.org/grpc/internal/transport/http2_server.go
index 45d7bd145..2b0fde334 100644
--- a/vendor/google.golang.org/grpc/internal/transport/http2_server.go
+++ b/vendor/google.golang.org/grpc/internal/transport/http2_server.go
@@ -82,7 +82,7 @@ type http2Server struct {
 	// updates, reset streams, and various settings) to the controller.
 	controlBuf *controlBuffer
 	fc         *trInFlow
-	stats      stats.Handler
+	stats      []stats.Handler
 	// Keepalive and max-age parameters for the server.
 	kp keepalive.ServerParameters
 	// Keepalive enforcement policy.
@@ -257,7 +257,7 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 		fc:                &trInFlow{limit: uint32(icwz)},
 		state:             reachable,
 		activeStreams:     make(map[uint32]*Stream),
-		stats:             config.StatsHandler,
+		stats:             config.StatsHandlers,
 		kp:                kp,
 		idle:              time.Now(),
 		kep:               kep,
@@ -272,13 +272,13 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 			updateFlowControl: t.updateFlowControl,
 		}
 	}
-	if t.stats != nil {
-		t.ctx = t.stats.TagConn(t.ctx, &stats.ConnTagInfo{
+	for _, sh := range t.stats {
+		t.ctx = sh.TagConn(t.ctx, &stats.ConnTagInfo{
 			RemoteAddr: t.remoteAddr,
 			LocalAddr:  t.localAddr,
 		})
 		connBegin := &stats.ConnBegin{}
-		t.stats.HandleConn(t.ctx, connBegin)
+		sh.HandleConn(t.ctx, connBegin)
 	}
 	t.channelzID, err = channelz.RegisterNormalSocket(t, config.ChannelzParentID, fmt.Sprintf("%s -> %s", t.remoteAddr, t.localAddr))
 	if err != nil {
@@ -570,8 +570,8 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 		t.adjustWindow(s, uint32(n))
 	}
 	s.ctx = traceCtx(s.ctx, s.method)
-	if t.stats != nil {
-		s.ctx = t.stats.TagRPC(s.ctx, &stats.RPCTagInfo{FullMethodName: s.method})
+	for _, sh := range t.stats {
+		s.ctx = sh.TagRPC(s.ctx, &stats.RPCTagInfo{FullMethodName: s.method})
 		inHeader := &stats.InHeader{
 			FullMethod:  s.method,
 			RemoteAddr:  t.remoteAddr,
@@ -580,7 +580,7 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 			WireLength:  int(frame.Header().Length),
 			Header:      metadata.MD(mdata).Copy(),
 		}
-		t.stats.HandleRPC(s.ctx, inHeader)
+		sh.HandleRPC(s.ctx, inHeader)
 	}
 	s.ctxDone = s.ctx.Done()
 	s.wq = newWriteQuota(defaultWriteQuota, s.ctxDone)
@@ -996,14 +996,14 @@ func (t *http2Server) writeHeaderLocked(s *Stream) error {
 		t.closeStream(s, true, http2.ErrCodeInternal, false)
 		return ErrHeaderListSizeLimitViolation
 	}
-	if t.stats != nil {
+	for _, sh := range t.stats {
 		// Note: Headers are compressed with hpack after this call returns.
 		// No WireLength field is set here.
 		outHeader := &stats.OutHeader{
 			Header:      s.header.Copy(),
 			Compression: s.sendCompress,
 		}
-		t.stats.HandleRPC(s.Context(), outHeader)
+		sh.HandleRPC(s.Context(), outHeader)
 	}
 	return nil
 }
@@ -1064,10 +1064,10 @@ func (t *http2Server) WriteStatus(s *Stream, st *status.Status) error {
 	// Send a RST_STREAM after the trailers if the client has not already half-closed.
 	rst := s.getState() == streamActive
 	t.finishStream(s, rst, http2.ErrCodeNo, trailingHeader, true)
-	if t.stats != nil {
+	for _, sh := range t.stats {
 		// Note: The trailer fields are compressed with hpack after this call returns.
 		// No WireLength field is set here.
-		t.stats.HandleRPC(s.Context(), &stats.OutTrailer{
+		sh.HandleRPC(s.Context(), &stats.OutTrailer{
 			Trailer: s.trailer.Copy(),
 		})
 	}
@@ -1222,9 +1222,9 @@ func (t *http2Server) Close() {
 	for _, s := range streams {
 		s.cancel()
 	}
-	if t.stats != nil {
+	for _, sh := range t.stats {
 		connEnd := &stats.ConnEnd{}
-		t.stats.HandleConn(t.ctx, connEnd)
+		sh.HandleConn(t.ctx, connEnd)
 	}
 }
 
diff --git a/vendor/google.golang.org/grpc/internal/transport/http_util.go b/vendor/google.golang.org/grpc/internal/transport/http_util.go
index d8247bcdf..b77513068 100644
--- a/vendor/google.golang.org/grpc/internal/transport/http_util.go
+++ b/vendor/google.golang.org/grpc/internal/transport/http_util.go
@@ -322,8 +322,6 @@ type bufWriter struct {
 	batchSize int
 	conn      net.Conn
 	err       error
-
-	onFlush func()
 }
 
 func newBufWriter(conn net.Conn, batchSize int) *bufWriter {
@@ -360,9 +358,6 @@ func (w *bufWriter) Flush() error {
 	if w.offset == 0 {
 		return nil
 	}
-	if w.onFlush != nil {
-		w.onFlush()
-	}
 	_, w.err = w.conn.Write(w.buf[:w.offset])
 	w.offset = 0
 	return w.err
diff --git a/vendor/google.golang.org/grpc/internal/transport/transport.go b/vendor/google.golang.org/grpc/internal/transport/transport.go
index a9ce717f1..6c3ba8515 100644
--- a/vendor/google.golang.org/grpc/internal/transport/transport.go
+++ b/vendor/google.golang.org/grpc/internal/transport/transport.go
@@ -523,7 +523,7 @@ type ServerConfig struct {
 	ConnectionTimeout     time.Duration
 	Credentials           credentials.TransportCredentials
 	InTapHandle           tap.ServerInHandle
-	StatsHandler          stats.Handler
+	StatsHandlers         []stats.Handler
 	KeepaliveParams       keepalive.ServerParameters
 	KeepalivePolicy       keepalive.EnforcementPolicy
 	InitialWindowSize     int32
@@ -553,8 +553,8 @@ type ConnectOptions struct {
 	CredsBundle credentials.Bundle
 	// KeepaliveParams stores the keepalive parameters.
 	KeepaliveParams keepalive.ClientParameters
-	// StatsHandler stores the handler for stats.
-	StatsHandler stats.Handler
+	// StatsHandlers stores the handler for stats.
+	StatsHandlers []stats.Handler
 	// InitialWindowSize sets the initial window size for a stream.
 	InitialWindowSize int32
 	// InitialConnWindowSize sets the initial window size for a connection.
diff --git a/vendor/google.golang.org/grpc/regenerate.sh b/vendor/google.golang.org/grpc/regenerate.sh
index 978b89f37..99db79faf 100644
--- a/vendor/google.golang.org/grpc/regenerate.sh
+++ b/vendor/google.golang.org/grpc/regenerate.sh
@@ -68,7 +68,6 @@ SOURCES=(
   ${WORKDIR}/grpc-proto/grpc/gcp/transport_security_common.proto
   ${WORKDIR}/grpc-proto/grpc/lookup/v1/rls.proto
   ${WORKDIR}/grpc-proto/grpc/lookup/v1/rls_config.proto
-  ${WORKDIR}/grpc-proto/grpc/service_config/service_config.proto
   ${WORKDIR}/grpc-proto/grpc/testing/*.proto
   ${WORKDIR}/grpc-proto/grpc/core/*.proto
 )
@@ -80,8 +79,7 @@ SOURCES=(
 # Note that the protos listed here are all for testing purposes. All protos to
 # be used externally should have a go_package option (and they don't need to be
 # listed here).
-OPTS=Mgrpc/service_config/service_config.proto=/internal/proto/grpc_service_config,\
-Mgrpc/core/stats.proto=google.golang.org/grpc/interop/grpc_testing/core,\
+OPTS=Mgrpc/core/stats.proto=google.golang.org/grpc/interop/grpc_testing/core,\
 Mgrpc/testing/benchmark_service.proto=google.golang.org/grpc/interop/grpc_testing,\
 Mgrpc/testing/stats.proto=google.golang.org/grpc/interop/grpc_testing,\
 Mgrpc/testing/report_qps_scenario_service.proto=google.golang.org/grpc/interop/grpc_testing,\
@@ -121,9 +119,6 @@ mv ${WORKDIR}/out/google.golang.org/grpc/lookup/grpc_lookup_v1/* ${WORKDIR}/out/
 # see grpc_testing_not_regenerate/README.md for details.
 rm ${WORKDIR}/out/google.golang.org/grpc/reflection/grpc_testing_not_regenerate/*.pb.go
 
-# grpc/service_config/service_config.proto does not have a go_package option.
-mv ${WORKDIR}/out/grpc/service_config/service_config.pb.go internal/proto/grpc_service_config
-
 # grpc/testing does not have a go_package option.
 mv ${WORKDIR}/out/grpc/testing/*.pb.go interop/grpc_testing/
 mv ${WORKDIR}/out/grpc/core/*.pb.go interop/grpc_testing/core/
diff --git a/vendor/google.golang.org/grpc/resolver/map.go b/vendor/google.golang.org/grpc/resolver/map.go
index e87ecd0ee..efcb7f3ef 100644
--- a/vendor/google.golang.org/grpc/resolver/map.go
+++ b/vendor/google.golang.org/grpc/resolver/map.go
@@ -28,25 +28,40 @@ type addressMapEntry struct {
 // Multiple accesses may not be performed concurrently.  Must be created via
 // NewAddressMap; do not construct directly.
 type AddressMap struct {
-	m map[string]addressMapEntryList
+	// The underlying map is keyed by an Address with fields that we don't care
+	// about being set to their zero values. The only fields that we care about
+	// are `Addr`, `ServerName` and `Attributes`. Since we need to be able to
+	// distinguish between addresses with same `Addr` and `ServerName`, but
+	// different `Attributes`, we cannot store the `Attributes` in the map key.
+	//
+	// The comparison operation for structs work as follows:
+	//  Struct values are comparable if all their fields are comparable. Two
+	//  struct values are equal if their corresponding non-blank fields are equal.
+	//
+	// The value type of the map contains a slice of addresses which match the key
+	// in their `Addr` and `ServerName` fields and contain the corresponding value
+	// associated with them.
+	m map[Address]addressMapEntryList
+}
+
+func toMapKey(addr *Address) Address {
+	return Address{Addr: addr.Addr, ServerName: addr.ServerName}
 }
 
 type addressMapEntryList []*addressMapEntry
 
 // NewAddressMap creates a new AddressMap.
 func NewAddressMap() *AddressMap {
-	return &AddressMap{m: make(map[string]addressMapEntryList)}
+	return &AddressMap{m: make(map[Address]addressMapEntryList)}
 }
 
 // find returns the index of addr in the addressMapEntry slice, or -1 if not
 // present.
 func (l addressMapEntryList) find(addr Address) int {
-	if len(l) == 0 {
-		return -1
-	}
 	for i, entry := range l {
-		if entry.addr.ServerName == addr.ServerName &&
-			entry.addr.Attributes.Equal(addr.Attributes) {
+		// Attributes are the only thing to match on here, since `Addr` and
+		// `ServerName` are already equal.
+		if entry.addr.Attributes.Equal(addr.Attributes) {
 			return i
 		}
 	}
@@ -55,7 +70,8 @@ func (l addressMapEntryList) find(addr Address) int {
 
 // Get returns the value for the address in the map, if present.
 func (a *AddressMap) Get(addr Address) (value interface{}, ok bool) {
-	entryList := a.m[addr.Addr]
+	addrKey := toMapKey(&addr)
+	entryList := a.m[addrKey]
 	if entry := entryList.find(addr); entry != -1 {
 		return entryList[entry].value, true
 	}
@@ -64,17 +80,19 @@ func (a *AddressMap) Get(addr Address) (value interface{}, ok bool) {
 
 // Set updates or adds the value to the address in the map.
 func (a *AddressMap) Set(addr Address, value interface{}) {
-	entryList := a.m[addr.Addr]
+	addrKey := toMapKey(&addr)
+	entryList := a.m[addrKey]
 	if entry := entryList.find(addr); entry != -1 {
-		a.m[addr.Addr][entry].value = value
+		entryList[entry].value = value
 		return
 	}
-	a.m[addr.Addr] = append(a.m[addr.Addr], &addressMapEntry{addr: addr, value: value})
+	a.m[addrKey] = append(entryList, &addressMapEntry{addr: addr, value: value})
 }
 
 // Delete removes addr from the map.
 func (a *AddressMap) Delete(addr Address) {
-	entryList := a.m[addr.Addr]
+	addrKey := toMapKey(&addr)
+	entryList := a.m[addrKey]
 	entry := entryList.find(addr)
 	if entry == -1 {
 		return
@@ -85,7 +103,7 @@ func (a *AddressMap) Delete(addr Address) {
 		copy(entryList[entry:], entryList[entry+1:])
 		entryList = entryList[:len(entryList)-1]
 	}
-	a.m[addr.Addr] = entryList
+	a.m[addrKey] = entryList
 }
 
 // Len returns the number of entries in the map.
@@ -107,3 +125,14 @@ func (a *AddressMap) Keys() []Address {
 	}
 	return ret
 }
+
+// Values returns a slice of all current map values.
+func (a *AddressMap) Values() []interface{} {
+	ret := make([]interface{}, 0, a.Len())
+	for _, entryList := range a.m {
+		for _, entry := range entryList {
+			ret = append(ret, entry.value)
+		}
+	}
+	return ret
+}
diff --git a/vendor/google.golang.org/grpc/server.go b/vendor/google.golang.org/grpc/server.go
index 65de84b30..b54f5bb57 100644
--- a/vendor/google.golang.org/grpc/server.go
+++ b/vendor/google.golang.org/grpc/server.go
@@ -73,6 +73,12 @@ func init() {
 	internal.DrainServerTransports = func(srv *Server, addr string) {
 		srv.drainServerTransports(addr)
 	}
+	internal.AddExtraServerOptions = func(opt ...ServerOption) {
+		extraServerOptions = opt
+	}
+	internal.ClearExtraServerOptions = func() {
+		extraServerOptions = nil
+	}
 }
 
 var statusOK = status.New(codes.OK, "")
@@ -150,7 +156,7 @@ type serverOptions struct {
 	chainUnaryInts        []UnaryServerInterceptor
 	chainStreamInts       []StreamServerInterceptor
 	inTapHandle           tap.ServerInHandle
-	statsHandler          stats.Handler
+	statsHandlers         []stats.Handler
 	maxConcurrentStreams  uint32
 	maxReceiveMessageSize int
 	maxSendMessageSize    int
@@ -174,6 +180,7 @@ var defaultServerOptions = serverOptions{
 	writeBufferSize:       defaultWriteBufSize,
 	readBufferSize:        defaultReadBufSize,
 }
+var extraServerOptions []ServerOption
 
 // A ServerOption sets options such as credentials, codec and keepalive parameters, etc.
 type ServerOption interface {
@@ -435,7 +442,7 @@ func InTapHandle(h tap.ServerInHandle) ServerOption {
 // StatsHandler returns a ServerOption that sets the stats handler for the server.
 func StatsHandler(h stats.Handler) ServerOption {
 	return newFuncServerOption(func(o *serverOptions) {
-		o.statsHandler = h
+		o.statsHandlers = append(o.statsHandlers, h)
 	})
 }
 
@@ -560,6 +567,9 @@ func (s *Server) stopServerWorkers() {
 // started to accept requests yet.
 func NewServer(opt ...ServerOption) *Server {
 	opts := defaultServerOptions
+	for _, o := range extraServerOptions {
+		o.apply(&opts)
+	}
 	for _, o := range opt {
 		o.apply(&opts)
 	}
@@ -867,7 +877,7 @@ func (s *Server) newHTTP2Transport(c net.Conn) transport.ServerTransport {
 		ConnectionTimeout:     s.opts.connectionTimeout,
 		Credentials:           s.opts.creds,
 		InTapHandle:           s.opts.inTapHandle,
-		StatsHandler:          s.opts.statsHandler,
+		StatsHandlers:         s.opts.statsHandlers,
 		KeepaliveParams:       s.opts.keepaliveParams,
 		KeepalivePolicy:       s.opts.keepalivePolicy,
 		InitialWindowSize:     s.opts.initialWindowSize,
@@ -963,7 +973,7 @@ var _ http.Handler = (*Server)(nil)
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a
 // later release.
 func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	st, err := transport.NewServerHandlerTransport(w, r, s.opts.statsHandler)
+	st, err := transport.NewServerHandlerTransport(w, r, s.opts.statsHandlers)
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
@@ -1076,8 +1086,10 @@ func (s *Server) sendResponse(t transport.ServerTransport, stream *transport.Str
 		return status.Errorf(codes.ResourceExhausted, "grpc: trying to send message larger than max (%d vs. %d)", len(payload), s.opts.maxSendMessageSize)
 	}
 	err = t.Write(stream, hdr, payload, opts)
-	if err == nil && s.opts.statsHandler != nil {
-		s.opts.statsHandler.HandleRPC(stream.Context(), outPayload(false, msg, data, payload, time.Now()))
+	if err == nil {
+		for _, sh := range s.opts.statsHandlers {
+			sh.HandleRPC(stream.Context(), outPayload(false, msg, data, payload, time.Now()))
+		}
 	}
 	return err
 }
@@ -1124,13 +1136,13 @@ func chainUnaryInterceptors(interceptors []UnaryServerInterceptor) UnaryServerIn
 }
 
 func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.Stream, info *serviceInfo, md *MethodDesc, trInfo *traceInfo) (err error) {
-	sh := s.opts.statsHandler
-	if sh != nil || trInfo != nil || channelz.IsOn() {
+	shs := s.opts.statsHandlers
+	if len(shs) != 0 || trInfo != nil || channelz.IsOn() {
 		if channelz.IsOn() {
 			s.incrCallsStarted()
 		}
 		var statsBegin *stats.Begin
-		if sh != nil {
+		for _, sh := range shs {
 			beginTime := time.Now()
 			statsBegin = &stats.Begin{
 				BeginTime:      beginTime,
@@ -1161,7 +1173,7 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 				trInfo.tr.Finish()
 			}
 
-			if sh != nil {
+			for _, sh := range shs {
 				end := &stats.End{
 					BeginTime: statsBegin.BeginTime,
 					EndTime:   time.Now(),
@@ -1243,7 +1255,7 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 	}
 
 	var payInfo *payloadInfo
-	if sh != nil || binlog != nil {
+	if len(shs) != 0 || binlog != nil {
 		payInfo = &payloadInfo{}
 	}
 	d, err := recvAndDecompress(&parser{r: stream}, stream, dc, s.opts.maxReceiveMessageSize, payInfo, decomp)
@@ -1260,7 +1272,7 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 		if err := s.getCodec(stream.ContentSubtype()).Unmarshal(d, v); err != nil {
 			return status.Errorf(codes.Internal, "grpc: error unmarshalling request: %v", err)
 		}
-		if sh != nil {
+		for _, sh := range shs {
 			sh.HandleRPC(stream.Context(), &stats.InPayload{
 				RecvTime:   time.Now(),
 				Payload:    v,
@@ -1418,16 +1430,18 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 	if channelz.IsOn() {
 		s.incrCallsStarted()
 	}
-	sh := s.opts.statsHandler
+	shs := s.opts.statsHandlers
 	var statsBegin *stats.Begin
-	if sh != nil {
+	if len(shs) != 0 {
 		beginTime := time.Now()
 		statsBegin = &stats.Begin{
 			BeginTime:      beginTime,
 			IsClientStream: sd.ClientStreams,
 			IsServerStream: sd.ServerStreams,
 		}
-		sh.HandleRPC(stream.Context(), statsBegin)
+		for _, sh := range shs {
+			sh.HandleRPC(stream.Context(), statsBegin)
+		}
 	}
 	ctx := NewContextWithServerTransportStream(stream.Context(), stream)
 	ss := &serverStream{
@@ -1439,10 +1453,10 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 		maxReceiveMessageSize: s.opts.maxReceiveMessageSize,
 		maxSendMessageSize:    s.opts.maxSendMessageSize,
 		trInfo:                trInfo,
-		statsHandler:          sh,
+		statsHandler:          shs,
 	}
 
-	if sh != nil || trInfo != nil || channelz.IsOn() {
+	if len(shs) != 0 || trInfo != nil || channelz.IsOn() {
 		// See comment in processUnaryRPC on defers.
 		defer func() {
 			if trInfo != nil {
@@ -1456,7 +1470,7 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 				ss.mu.Unlock()
 			}
 
-			if sh != nil {
+			if len(shs) != 0 {
 				end := &stats.End{
 					BeginTime: statsBegin.BeginTime,
 					EndTime:   time.Now(),
@@ -1464,7 +1478,9 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 				if err != nil && err != io.EOF {
 					end.Error = toRPCErr(err)
 				}
-				sh.HandleRPC(stream.Context(), end)
+				for _, sh := range shs {
+					sh.HandleRPC(stream.Context(), end)
+				}
 			}
 
 			if channelz.IsOn() {
diff --git a/vendor/google.golang.org/grpc/stream.go b/vendor/google.golang.org/grpc/stream.go
index 236fc17ec..6d82e0d7c 100644
--- a/vendor/google.golang.org/grpc/stream.go
+++ b/vendor/google.golang.org/grpc/stream.go
@@ -374,9 +374,9 @@ func (cs *clientStream) newAttemptLocked(isTransparent bool) (*csAttempt, error)
 
 	ctx := newContextWithRPCInfo(cs.ctx, cs.callInfo.failFast, cs.callInfo.codec, cs.cp, cs.comp)
 	method := cs.callHdr.Method
-	sh := cs.cc.dopts.copts.StatsHandler
 	var beginTime time.Time
-	if sh != nil {
+	shs := cs.cc.dopts.copts.StatsHandlers
+	for _, sh := range shs {
 		ctx = sh.TagRPC(ctx, &stats.RPCTagInfo{FullMethodName: method, FailFast: cs.callInfo.failFast})
 		beginTime = time.Now()
 		begin := &stats.Begin{
@@ -414,12 +414,12 @@ func (cs *clientStream) newAttemptLocked(isTransparent bool) (*csAttempt, error)
 	}
 
 	return &csAttempt{
-		ctx:          ctx,
-		beginTime:    beginTime,
-		cs:           cs,
-		dc:           cs.cc.dopts.dc,
-		statsHandler: sh,
-		trInfo:       trInfo,
+		ctx:           ctx,
+		beginTime:     beginTime,
+		cs:            cs,
+		dc:            cs.cc.dopts.dc,
+		statsHandlers: shs,
+		trInfo:        trInfo,
 	}, nil
 }
 
@@ -536,8 +536,8 @@ type csAttempt struct {
 	// and cleared when the finish method is called.
 	trInfo *traceInfo
 
-	statsHandler stats.Handler
-	beginTime    time.Time
+	statsHandlers []stats.Handler
+	beginTime     time.Time
 
 	// set for newStream errors that may be transparently retried
 	allowTransparentRetry bool
@@ -960,8 +960,8 @@ func (a *csAttempt) sendMsg(m interface{}, hdr, payld, data []byte) error {
 		}
 		return io.EOF
 	}
-	if a.statsHandler != nil {
-		a.statsHandler.HandleRPC(a.ctx, outPayload(true, m, data, payld, time.Now()))
+	for _, sh := range a.statsHandlers {
+		sh.HandleRPC(a.ctx, outPayload(true, m, data, payld, time.Now()))
 	}
 	if channelz.IsOn() {
 		a.t.IncrMsgSent()
@@ -971,7 +971,7 @@ func (a *csAttempt) sendMsg(m interface{}, hdr, payld, data []byte) error {
 
 func (a *csAttempt) recvMsg(m interface{}, payInfo *payloadInfo) (err error) {
 	cs := a.cs
-	if a.statsHandler != nil && payInfo == nil {
+	if len(a.statsHandlers) != 0 && payInfo == nil {
 		payInfo = &payloadInfo{}
 	}
 
@@ -1008,8 +1008,8 @@ func (a *csAttempt) recvMsg(m interface{}, payInfo *payloadInfo) (err error) {
 		}
 		a.mu.Unlock()
 	}
-	if a.statsHandler != nil {
-		a.statsHandler.HandleRPC(a.ctx, &stats.InPayload{
+	for _, sh := range a.statsHandlers {
+		sh.HandleRPC(a.ctx, &stats.InPayload{
 			Client:   true,
 			RecvTime: time.Now(),
 			Payload:  m,
@@ -1068,7 +1068,7 @@ func (a *csAttempt) finish(err error) {
 			ServerLoad:    balancerload.Parse(tr),
 		})
 	}
-	if a.statsHandler != nil {
+	for _, sh := range a.statsHandlers {
 		end := &stats.End{
 			Client:    true,
 			BeginTime: a.beginTime,
@@ -1076,7 +1076,7 @@ func (a *csAttempt) finish(err error) {
 			Trailer:   tr,
 			Error:     err,
 		}
-		a.statsHandler.HandleRPC(a.ctx, end)
+		sh.HandleRPC(a.ctx, end)
 	}
 	if a.trInfo != nil && a.trInfo.tr != nil {
 		if err == nil {
@@ -1445,7 +1445,7 @@ type serverStream struct {
 	maxSendMessageSize    int
 	trInfo                *traceInfo
 
-	statsHandler stats.Handler
+	statsHandler []stats.Handler
 
 	binlog binarylog.MethodLogger
 	// serverHeaderBinlogged indicates whether server header has been logged. It
@@ -1555,8 +1555,10 @@ func (ss *serverStream) SendMsg(m interface{}) (err error) {
 			Message: data,
 		})
 	}
-	if ss.statsHandler != nil {
-		ss.statsHandler.HandleRPC(ss.s.Context(), outPayload(false, m, data, payload, time.Now()))
+	if len(ss.statsHandler) != 0 {
+		for _, sh := range ss.statsHandler {
+			sh.HandleRPC(ss.s.Context(), outPayload(false, m, data, payload, time.Now()))
+		}
 	}
 	return nil
 }
@@ -1590,7 +1592,7 @@ func (ss *serverStream) RecvMsg(m interface{}) (err error) {
 		}
 	}()
 	var payInfo *payloadInfo
-	if ss.statsHandler != nil || ss.binlog != nil {
+	if len(ss.statsHandler) != 0 || ss.binlog != nil {
 		payInfo = &payloadInfo{}
 	}
 	if err := recv(ss.p, ss.codec, ss.s, ss.dc, m, ss.maxReceiveMessageSize, payInfo, ss.decomp); err != nil {
@@ -1605,15 +1607,17 @@ func (ss *serverStream) RecvMsg(m interface{}) (err error) {
 		}
 		return toRPCErr(err)
 	}
-	if ss.statsHandler != nil {
-		ss.statsHandler.HandleRPC(ss.s.Context(), &stats.InPayload{
-			RecvTime: time.Now(),
-			Payload:  m,
-			// TODO truncate large payload.
-			Data:       payInfo.uncompressedBytes,
-			WireLength: payInfo.wireLength + headerLen,
-			Length:     len(payInfo.uncompressedBytes),
-		})
+	if len(ss.statsHandler) != 0 {
+		for _, sh := range ss.statsHandler {
+			sh.HandleRPC(ss.s.Context(), &stats.InPayload{
+				RecvTime: time.Now(),
+				Payload:  m,
+				// TODO truncate large payload.
+				Data:       payInfo.uncompressedBytes,
+				WireLength: payInfo.wireLength + headerLen,
+				Length:     len(payInfo.uncompressedBytes),
+			})
+		}
 	}
 	if ss.binlog != nil {
 		ss.binlog.Log(&binarylog.ClientMessage{
diff --git a/vendor/google.golang.org/grpc/version.go b/vendor/google.golang.org/grpc/version.go
index 5bc03f9b3..0eb2998cb 100644
--- a/vendor/google.golang.org/grpc/version.go
+++ b/vendor/google.golang.org/grpc/version.go
@@ -19,4 +19,4 @@
 package grpc
 
 // Version is the current grpc version.
-const Version = "1.47.0"
+const Version = "1.48.0"
diff --git a/vendor/modules.txt b/vendor/modules.txt
index fd296357f..79f671b00 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -662,7 +662,7 @@ google.golang.org/appengine/urlfetch
 google.golang.org/genproto/googleapis/api/httpbody
 google.golang.org/genproto/googleapis/rpc/status
 google.golang.org/genproto/protobuf/field_mask
-# google.golang.org/grpc v1.47.0
+# google.golang.org/grpc v1.48.0
 ## explicit; go 1.14
 google.golang.org/grpc
 google.golang.org/grpc/attributes