diff --git a/cmd/servicechecker/main.go b/cmd/servicechecker/main.go
index 13ad43c..4cd349b 100644
--- a/cmd/servicechecker/main.go
+++ b/cmd/servicechecker/main.go
@@ -8,6 +8,7 @@ import (
 	"time"
 
 	openapi_v3 "github.com/google/gnostic/openapiv3"
+	"github.com/google/uuid"
 	grpccli "go.unistack.org/micro-client-grpc/v3"
 	httpcli "go.unistack.org/micro-client-http/v3"
 	jsoncodec "go.unistack.org/micro-codec-json/v3"
@@ -156,7 +157,7 @@ func main() {
 	l.Info(ctx, "exiting")
 }
 
-func newHTTPTask(ctx context.Context, l logger.Logger, m meter.Meter, check string, task *config.Task) (any, []any, error) {
+func newHTTPTask(ctx context.Context, l logger.Logger, m meter.Meter, check string, task *config.TaskConfig) (any, []any, error) {
 	var err error
 
 	c, ok := clients["http"]
@@ -193,6 +194,7 @@ func newHTTPTask(ctx context.Context, l logger.Logger, m meter.Meter, check stri
 			httpcli.ErrorMap(errmap),
 			httpcli.Method(task.HTTP.Method),
 			httpcli.Path(task.HTTP.Endpoint),
+
 			// client.WithContentType("application/json"),
 		}
 
@@ -205,18 +207,39 @@ func newHTTPTask(ctx context.Context, l logger.Logger, m meter.Meter, check stri
 	}
 
 	fn := func() {
+		var cerr error
+
+		metadata := make(map[string]string, len(task.HTTP.Metadata))
+		var rquid string
+		for k, v := range task.HTTP.Metadata {
+			if k == "x-request-id" && v == "generate" {
+				uid, err := uuid.NewV7()
+				if err != nil {
+					l.Error(ctx, "failed to generate x-request-id", err)
+					uid = uuid.Nil
+				} else {
+					v = uid.String()
+				}
+			}
+			metadata[k] = v
+			rquid = v
+		}
+
+		l.Info(ctx, fmt.Sprintf("call %s.%s endpoint %s", treq.Service(), treq.Method(), treq.Endpoint()), "x-request-id", rquid)
 		m.Counter(semconv.ClientRequestInflight, labels...).Inc()
 		ts := time.Now()
-		// l.Info(ctx, fmt.Sprintf("try to call %s.%s via %s", task.Name, task.Name, task.HTTP.Addr))
-		err = httpconn.Call(ctx, l, c, task.HTTP.Addr, time.Duration(task.Timeout),
+		cerr = httpconn.Call(ctx, rquid, l, c, task.HTTP.Addr, time.Duration(task.Timeout),
 			treq,
 			rsp,
-			opts...)
+			append(opts, client.WithRequestMetadata(metadata))...,
+		)
 		te := time.Since(ts)
+		m.Counter(semconv.ClientRequestInflight, labels...).Dec()
+
 		m.Summary(semconv.ClientRequestLatencyMicroseconds, labels...).Update(te.Seconds())
 		m.Histogram(semconv.ClientRequestDurationSeconds, labels...).Update(te.Seconds())
-		m.Counter(semconv.ClientRequestInflight, labels...).Dec()
-		if err != nil {
+
+		if cerr != nil {
 			m.Counter(semconv.ClientRequestTotal, append(labels, "status", "failure")...).Inc()
 		} else {
 			m.Counter(semconv.ClientRequestTotal, append(labels, "status", "success")...).Inc()
@@ -226,7 +249,7 @@ func newHTTPTask(ctx context.Context, l logger.Logger, m meter.Meter, check stri
 	return fn, nil, nil
 }
 
-func newGRPCTask(ctx context.Context, l logger.Logger, m meter.Meter, check string, task *config.Task) (any, []any, error) {
+func newGRPCTask(ctx context.Context, l logger.Logger, m meter.Meter, check string, task *config.TaskConfig) (any, []any, error) {
 	var err error
 
 	c, ok := clients["grpc"]
@@ -296,17 +319,38 @@ func newGRPCTask(ctx context.Context, l logger.Logger, m meter.Meter, check stri
 	}
 
 	fn := func() {
+		var cerr error
+		var rquid string
+		metadata := make(map[string]string, len(task.HTTP.Metadata))
+		for k, v := range task.GRPC.Metadata {
+			if k == "x-request-id" && v == "generate" {
+				uid, err := uuid.NewV7()
+				if err != nil {
+					l.Error(ctx, "failed to generate x-request-id", err)
+					uid = uuid.Nil
+				} else {
+					v = uid.String()
+				}
+			}
+			metadata[k] = v
+			rquid = v
+		}
+
+		l.Info(ctx, fmt.Sprintf("call %s.%s endpoint %s", treq.Service(), treq.Method(), treq.Endpoint()), "x-request-id", rquid)
 		m.Counter(semconv.ClientRequestInflight, labels...).Inc()
 		ts := time.Now()
-
-		err = grpcconn.Call(ctx, l, c, task.GRPC.Addr, time.Duration(task.Timeout),
+		cerr = grpcconn.Call(ctx, rquid, l, c, task.GRPC.Addr, time.Duration(task.Timeout),
 			treq,
-			rsp)
+			rsp,
+			client.WithRequestMetadata(metadata),
+		)
 		te := time.Since(ts)
+		m.Counter(semconv.ClientRequestInflight, labels...).Dec()
+
 		m.Summary(semconv.ClientRequestLatencyMicroseconds, labels...).Update(te.Seconds())
 		m.Histogram(semconv.ClientRequestDurationSeconds, labels...).Update(te.Seconds())
-		m.Counter(semconv.ClientRequestInflight, labels...).Dec()
-		if err != nil {
+
+		if cerr != nil {
 			m.Counter(semconv.ClientRequestTotal, append(labels, "status", "failure")...).Inc()
 		} else {
 			m.Counter(semconv.ClientRequestTotal, append(labels, "status", "success")...).Inc()
diff --git a/pkg/config/config.go b/pkg/config/config.go
index d42d9cf..7acb673 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -7,46 +7,53 @@ import (
 	mtime "go.unistack.org/micro/v3/util/time"
 )
 
-type Meter struct {
+type AppConfig struct {
+	MultiUser bool `json:"multi_user,omitempty" yaml:"multi_user,omitempty"`
+}
+
+type MeterConfig struct {
 	Addr string `json:"addr,omitempty" yaml:"addr,omitempty"`
 	Path string `json:"path,omitempty" yaml:"path,omitempty"`
 }
 
 type Config struct {
-	Meter  *Meter   `json:"meter,omitempty" yaml:"meter,omitempty"`
-	Checks []*Check `json:"checks,omitempty" yaml:"checks,omitempty"`
+	Meter  *MeterConfig   `json:"meter,omitempty" yaml:"meter,omitempty"`
+	Checks []*CheckConfig `json:"checks,omitempty" yaml:"checks,omitempty"`
 }
 
-type Check struct {
+type CheckConfig struct {
 	Name     string         `json:"name,omitempty" yaml:"name,omitempty"`
-	Tasks    []*Task        `json:"tasks,omitempty" yaml:"tasks,omitempty"`
+	Tasks    []*TaskConfig  `json:"tasks,omitempty" yaml:"tasks,omitempty"`
 	Timeout  mtime.Duration `json:"timeout,omitempty" yaml:"timeout,omitempty"`
 	Interval mtime.Duration `json:"interval,omitempty" yaml:"interval,omitempty"`
 	Active   bool           `json:"active,omitempty" yaml:"active,omitempty"`
 }
 
 type HTTPConfig struct {
-	Endpoint string `json:"endpoint,omitempty" yaml:"endpoint,omitempty"`
-	Data     string `json:"data,omitempty" yaml:"data,omitempty"`
-	Addr     string `json:"addr,omitempty" yaml:"addr,omitempty"`
-	OpenAPI  string `json:"openapi,omitempty" yaml:"openapi,omitempty"`
-	Method   string `json:"method,omitempty" yaml:"method,omitempty"`
+	Metadata map[string]string `json:"metadata,omitempty" yaml:"metadata,omitempty"`
+	Endpoint string            `json:"endpoint,omitempty" yaml:"endpoint,omitempty"`
+	Data     string            `json:"data,omitempty" yaml:"data,omitempty"`
+	Addr     string            `json:"addr,omitempty" yaml:"addr,omitempty"`
+	OpenAPI  string            `json:"openapi,omitempty" yaml:"openapi,omitempty"`
+	Method   string            `json:"method,omitempty" yaml:"method,omitempty"`
 }
 
 type GRPCConfig struct {
-	Endpoint string `json:"endpoint,omitempty" yaml:"endpoint,omitempty"`
-	Data     string `json:"data,omitempty" yaml:"data,omitempty"`
-	Addr     string `json:"addr,omitempty" yaml:"addr,omitempty"`
-	Protoset string `json:"protoset,omitempty" yaml:"protoset,omitempty"`
+	Metadata map[string]string `json:"metadata,omitempty" yaml:"metadata,omitempty"`
+	Endpoint string            `json:"endpoint,omitempty" yaml:"endpoint,omitempty"`
+	Data     string            `json:"data,omitempty" yaml:"data,omitempty"`
+	Addr     string            `json:"addr,omitempty" yaml:"addr,omitempty"`
+	Protoset string            `json:"protoset,omitempty" yaml:"protoset,omitempty"`
 }
 
 type GraphQLConfig struct {
-	Endpoint string `json:"endpoint,omitempty" yaml:"endpoint,omitempty"`
-	Data     string `json:"data,omitempty" yaml:"data,omitempty"`
-	Addr     string `json:"addr,omitempty" yaml:"addr,omitempty"`
+	Metadata map[string]string `json:"metadata,omitempty" yaml:"metadata,omitempty"`
+	Endpoint string            `json:"endpoint,omitempty" yaml:"endpoint,omitempty"`
+	Data     string            `json:"data,omitempty" yaml:"data,omitempty"`
+	Addr     string            `json:"addr,omitempty" yaml:"addr,omitempty"`
 }
 
-type Task struct {
+type TaskConfig struct {
 	HTTP      *HTTPConfig    `json:"http,omitempty" yaml:"http,omitempty"`
 	GRPC      *GRPCConfig    `json:"grpc,omitempty" yaml:"grpc,omitempty"`
 	GraphQL   *GraphQLConfig `json:"graphql,omitempty" yaml:"graphql"`
diff --git a/pkg/grpcconn/grpcconn.go b/pkg/grpcconn/grpcconn.go
index 58b4eed..48f85b5 100644
--- a/pkg/grpcconn/grpcconn.go
+++ b/pkg/grpcconn/grpcconn.go
@@ -5,18 +5,12 @@ import (
 	"strings"
 	"time"
 
-	"github.com/google/uuid"
 	"go.unistack.org/micro/v3/client"
 	"go.unistack.org/micro/v3/logger"
 )
 
-func Call(ctx context.Context, l logger.Logger, c client.Client, addr string, td time.Duration, req client.Request, rsp interface{}, opts ...client.CallOption) error {
+func Call(ctx context.Context, rquid string, l logger.Logger, c client.Client, addr string, td time.Duration, req client.Request, rsp interface{}, opts ...client.CallOption) error {
 	var err error
-	uid, err := uuid.NewRandom()
-	if err != nil {
-		l.Error(ctx, "failed to generate x-request-id", err)
-		return err
-	}
 
 	err = c.Call(ctx, req, rsp,
 		client.WithAddress(addr),
@@ -24,7 +18,7 @@ func Call(ctx context.Context, l logger.Logger, c client.Client, addr string, td
 		// client.WithContentType("application/json"),
 	)
 	if err != nil {
-		l.Error(ctx, "call failed", "x-request-id", uid.String(), err)
+		l.Error(ctx, "call failed", "x-request-id", rquid, err)
 		return err
 	}
 	return nil
diff --git a/pkg/httpconn/httpconn.go b/pkg/httpconn/httpconn.go
index a53e9ce..122cb48 100644
--- a/pkg/httpconn/httpconn.go
+++ b/pkg/httpconn/httpconn.go
@@ -4,18 +4,12 @@ import (
 	"context"
 	"time"
 
-	"github.com/google/uuid"
 	"go.unistack.org/micro/v3/client"
 	"go.unistack.org/micro/v3/logger"
 )
 
-func Call(ctx context.Context, l logger.Logger, c client.Client, addr string, td time.Duration, req client.Request, rsp interface{}, opts ...client.CallOption) error {
+func Call(ctx context.Context, rquid string, l logger.Logger, c client.Client, addr string, td time.Duration, req client.Request, rsp interface{}, opts ...client.CallOption) error {
 	var err error
-	uid, err := uuid.NewRandom()
-	if err != nil {
-		l.Error(ctx, "failed to generate x-request-id", err)
-		return err
-	}
 
 	err = c.Call(ctx, req, rsp,
 		client.WithAddress(addr),
@@ -23,7 +17,8 @@ func Call(ctx context.Context, l logger.Logger, c client.Client, addr string, td
 		// client.WithContentType("application/json"),
 	)
 	if err != nil {
-		l.Error(ctx, "call failed", "x-request-id", uid.String(), err)
+		//	httpcli.GetError(err)
+		l.Error(ctx, "call failed", "x-request-id", rquid, err)
 		return err
 	}
 	return nil