diff --git a/go.mod b/go.mod
index b4316a1..fd2d73a 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
-module go.unistack.org/micro-client-grpc/v3
+module go.unistack.org/micro-client-grpc/v4
 
-go 1.22.0
+go 1.23.0
 
 require (
 	go.unistack.org/micro/v4 v4.1.2
@@ -13,10 +13,10 @@ require (
 	github.com/matoous/go-nanoid v1.5.1 // indirect
 	github.com/spf13/cast v1.7.1 // indirect
 	go.unistack.org/micro-proto/v4 v4.1.0 // indirect
-	golang.org/x/net v0.34.0 // indirect
-	golang.org/x/sys v0.29.0 // indirect
-	golang.org/x/text v0.21.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20241216192217-9240e9c98484 // indirect
-	google.golang.org/protobuf v1.36.3 // indirect
+	golang.org/x/net v0.35.0 // indirect
+	golang.org/x/sys v0.30.0 // indirect
+	golang.org/x/text v0.22.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250224174004-546df14abb99 // indirect
+	google.golang.org/protobuf v1.36.5 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.sum b/go.sum
index 513fc1a..5710689 100644
--- a/go.sum
+++ b/go.sum
@@ -38,18 +38,18 @@ go.unistack.org/micro-proto/v4 v4.1.0 h1:qPwL2n/oqh9RE3RTTDgt28XK3QzV597VugQPaw9
 go.unistack.org/micro-proto/v4 v4.1.0/go.mod h1:ArmK7o+uFvxSY3dbJhKBBX4Pm1rhWdLEFf3LxBrMtec=
 go.unistack.org/micro/v4 v4.1.2 h1:9SOlPYyPNNFpg1A7BsvhDyQm3gysLH1AhWbDCp1hyoY=
 go.unistack.org/micro/v4 v4.1.2/go.mod h1:lr3oYED8Ay1vjK68QqRw30QOtdk/ffpZqMFDasOUhKw=
-golang.org/x/net v0.34.0 h1:Mb7Mrk043xzHgnRM88suvJFwzVrRfHEHJEl5/71CKw0=
-golang.org/x/net v0.34.0/go.mod h1:di0qlW3YNM5oh6GqDGQr92MyTozJPmybPK4Ev/Gm31k=
-golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
-golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/text v0.21.0 h1:zyQAAkrwaneQ066sspRyJaG9VNi/YJ1NfzcGB3hZ/qo=
-golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20241216192217-9240e9c98484 h1:Z7FRVJPSMaHQxD0uXU8WdgFh8PseLM8Q8NzhnpMrBhQ=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20241216192217-9240e9c98484/go.mod h1:lcTa1sDdWEIHMWlITnIczmw5w60CF9ffkb8Z+DVmmjA=
+golang.org/x/net v0.35.0 h1:T5GQRQb2y08kTAByq9L4/bz8cipCdA8FbRTXewonqY8=
+golang.org/x/net v0.35.0/go.mod h1:EglIi67kWsHKlRzzVMUD93VMSWGFOMSZgxFjparz1Qk=
+golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
+golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.22.0 h1:bofq7m3/HAFvbF51jz3Q9wLg3jkvSPuiZu/pD1XwgtM=
+golang.org/x/text v0.22.0/go.mod h1:YRoo4H8PVmsu+E3Ou7cqLVH8oXWIHVoX0jqUWALQhfY=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20250224174004-546df14abb99 h1:ZSlhAUqC4r8TPzqLXQ0m3upBNZeF+Y8jQ3c4CR3Ujms=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20250224174004-546df14abb99/go.mod h1:LuRYeWDFV6WOn90g357N17oMCaxpgCnbi/44qJvDn2I=
 google.golang.org/grpc v1.70.0 h1:pWFv03aZoHzlRKHWicjsZytKAiYCtNS0dHbXnIdq7jQ=
 google.golang.org/grpc v1.70.0/go.mod h1:ofIJqVKDXx/JiXrwr2IG4/zwdH9txy3IlF40RmcJSQw=
-google.golang.org/protobuf v1.36.3 h1:82DV7MYdb8anAVi3qge1wSnMDrnKK7ebr+I0hHRN1BU=
-google.golang.org/protobuf v1.36.3/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+google.golang.org/protobuf v1.36.5 h1:tPhr+woSbjfYvY6/GPufUoYizxw1cF/yFoxJ2fmpwlM=
+google.golang.org/protobuf v1.36.5/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
diff --git a/grpc.go b/grpc.go
index 1c26816..8297b82 100644
--- a/grpc.go
+++ b/grpc.go
@@ -5,8 +5,14 @@ import (
 	"context"
 	"crypto/tls"
 	"fmt"
+	"go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v4/semconv"
+	"go.unistack.org/micro/v4/tracer"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 	"net"
 	"reflect"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -28,8 +34,10 @@ const (
 )
 
 type grpcClient struct {
-	pool *ConnPool
-	opts client.Options
+	funcCall   client.FuncCall
+	funcStream client.FuncStream
+	pool       *ConnPool
+	opts       client.Options
 	sync.RWMutex
 	init bool
 }
@@ -69,10 +77,7 @@ func (g *grpcClient) call(ctx context.Context, addr string, req client.Request,
 	var header map[string][]string
 
 	if md, ok := metadata.FromOutgoingContext(ctx); ok {
-		header = make(map[string][]string, len(md))
-		for k, v := range md {
-			header[strings.ToLower(k)] = v
-		}
+		header = metadata.Copy(md)
 	} else {
 		header = make(map[string][]string, 2)
 	}
@@ -82,12 +87,11 @@ func (g *grpcClient) call(ctx context.Context, addr string, req client.Request,
 		}
 	}
 	// set timeout in nanoseconds
-	header["Grpc-Timeout"] = append(header["Grpc-Timeout"], fmt.Sprintf("%dn", opts.RequestTimeout))
+	header["grpc-timeout"] = append(header["grpc-timeout"], fmt.Sprintf("%dn", opts.RequestTimeout))
 	header["timeout"] = append(header["timeout"], fmt.Sprintf("%dn", opts.RequestTimeout))
 	header["content-type"] = append(header["content-type"], req.ContentType())
 
-	md := gmetadata.MD(metadata.Copy(header))
-	ctx = gmetadata.NewOutgoingContext(ctx, md)
+	ctx = gmetadata.NewOutgoingContext(ctx, header)
 
 	cf, err := g.newCodec(req.ContentType())
 	if err != nil {
@@ -170,7 +174,7 @@ func (g *grpcClient) call(ctx context.Context, addr string, req client.Request,
 	if opts.ResponseMetadata != nil {
 		*opts.ResponseMetadata = metadata.New(gmd.Len())
 		for k, v := range gmd {
-			opts.ResponseMetadata.Set(k, strings.Join(v, ","))
+			opts.ResponseMetadata.Append(k, v...)
 		}
 	}
 
@@ -181,24 +185,20 @@ func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request
 	var header map[string][]string
 
 	if md, ok := metadata.FromOutgoingContext(ctx); ok {
-		header = make(map[string][]string, len(md))
-		for k, v := range md {
-			header[k] = v
-		}
+		header = metadata.Copy(md)
 	} else {
 		header = make(map[string][]string)
 	}
 
 	// set timeout in nanoseconds
 	if opts.StreamTimeout > time.Duration(0) {
-		header["Grpc-Timeout"] = append(header["Grpc-Timeout"], fmt.Sprintf("%dn", opts.RequestTimeout))
+		header["grpc-timeout"] = append(header["grpc-timeout"], fmt.Sprintf("%dn", opts.RequestTimeout))
 		header["timeout"] = append(header["timeout"], fmt.Sprintf("%dn", opts.RequestTimeout))
 	}
 	// set the content type for the request
 	header["content-type"] = append(header["content-type"], req.ContentType())
 
-	md := gmetadata.MD(metadata.Copy(header))
-	ctx = gmetadata.NewOutgoingContext(ctx, md)
+	ctx = gmetadata.NewOutgoingContext(ctx, header)
 
 	cf, err := g.newCodec(req.ContentType())
 	if err != nil {
@@ -401,22 +401,17 @@ func (g *grpcClient) Init(opts ...client.Option) error {
 		g.pool.Unlock()
 	}
 
-	if err := g.opts.Broker.Init(); err != nil {
-		return err
-	}
-	if err := g.opts.Tracer.Init(); err != nil {
-		return err
-	}
-	if err := g.opts.Router.Init(); err != nil {
-		return err
-	}
-	if err := g.opts.Logger.Init(); err != nil {
-		return err
-	}
-	if err := g.opts.Meter.Init(); err != nil {
-		return err
-	}
+	g.funcCall = g.fnCall
+	g.funcStream = g.fnStream
 
+	g.opts.Hooks.EachPrev(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case client.HookCall:
+			g.funcCall = h(g.funcCall)
+		case client.HookStream:
+			g.funcStream = h(g.funcStream)
+		}
+	})
 	g.init = true
 
 	return nil
@@ -430,12 +425,7 @@ func (g *grpcClient) NewRequest(service, method string, req interface{}, reqOpts
 	return newGRPCRequest(service, method, req, g.opts.ContentType, reqOpts...)
 }
 
-func (g *grpcClient) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
-	if req == nil {
-		return errors.InternalServerError("go.micro.client", "req is nil")
-	} else if rsp == nil {
-		return errors.InternalServerError("go.micro.client", "rsp is nil")
-	}
+func (g *grpcClient) fnCall(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
 	// make a copy of call opts
 	callOpts := g.opts.CallOptions
 
@@ -565,7 +555,38 @@ func (g *grpcClient) Call(ctx context.Context, req client.Request, rsp interface
 	return gerr
 }
 
-func (g *grpcClient) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
+func (g *grpcClient) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
+	if req == nil {
+		return errors.InternalServerError("go.micro.client", "req is nil")
+	} else if rsp == nil {
+		return errors.InternalServerError("go.micro.client", "rsp is nil")
+	}
+
+	ts := time.Now()
+	g.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Inc()
+	var sp tracer.Span
+	ctx, sp = g.opts.Tracer.Start(ctx, req.Endpoint()+" rpc-client",
+		tracer.WithSpanKind(tracer.SpanKindClient),
+		tracer.WithSpanLabels("endpoint", req.Endpoint()),
+	)
+	err := g.funcCall(ctx, req, rsp, opts...)
+	g.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Dec()
+	te := time.Since(ts)
+	g.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+	g.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+
+	if me := errors.FromError(err); me == nil {
+		sp.Finish()
+		g.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "success", "code", strconv.Itoa(int(200))).Inc()
+	} else {
+		sp.SetStatus(tracer.SpanStatusError, err.Error())
+		g.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "failure", "code", strconv.Itoa(int(me.Code))).Inc()
+	}
+
+	return err
+}
+
+func (g *grpcClient) fnStream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
 	// make a copy of call opts
 	callOpts := g.opts.CallOptions
 	for _, opt := range opts {
@@ -693,6 +714,31 @@ func (g *grpcClient) Stream(ctx context.Context, req client.Request, opts ...cli
 	return nil, grr
 }
 
+func (g *grpcClient) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
+	ts := time.Now()
+	g.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Inc()
+	var sp tracer.Span
+	ctx, sp = g.opts.Tracer.Start(ctx, req.Endpoint()+" rpc-client",
+		tracer.WithSpanKind(tracer.SpanKindClient),
+		tracer.WithSpanLabels("endpoint", req.Endpoint()),
+	)
+	stream, err := g.funcStream(ctx, req, opts...)
+	g.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Dec()
+	te := time.Since(ts)
+	g.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+	g.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+
+	if me := status.Convert(err); me == nil {
+		sp.Finish()
+		g.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "success", "code", strconv.Itoa(int(codes.OK))).Inc()
+	} else {
+		sp.SetStatus(tracer.SpanStatusError, err.Error())
+		g.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "failure", "code", strconv.Itoa(int(me.Code()))).Inc()
+	}
+
+	return stream, err
+}
+
 func (g *grpcClient) String() string {
 	return "grpc"
 }