diff --git a/broker/memory.go b/broker/memory.go
index 832097cd..9e5e525f 100644
--- a/broker/memory.go
+++ b/broker/memory.go
@@ -190,7 +190,7 @@ func (m *MemoryBroker) Publish(ctx context.Context, message interface{}, opts ..
 						} else {
 							if sub.opts.AutoAck {
 								if err = p.Ack(); err != nil {
-									m.opts.Logger.Errorf(m.opts.Context, "ack failed: %v", err)
+									m.opts.Logger.Error(m.opts.Context, "ack failed: "+err.Error())
 									m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "failure").Inc()
 								} else {
 									m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "success").Inc()
diff --git a/config/config.go b/config/config.go
index 1736d446..e218e1d4 100644
--- a/config/config.go
+++ b/config/config.go
@@ -133,7 +133,7 @@ var (
 				return nil
 			}
 			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Errorf(ctx, "%s BeforeLoad err: %v", c.String(), err)
+				c.Options().Logger.Error(ctx, c.String()+" BeforeLoad error "+err.Error())
 				if !c.Options().AllowFail {
 					return err
 				}
@@ -148,7 +148,7 @@ var (
 				return nil
 			}
 			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Errorf(ctx, "%s AfterLoad err: %v", c.String(), err)
+				c.Options().Logger.Error(ctx, c.String()+" AfterLoad error "+err.Error())
 				if !c.Options().AllowFail {
 					return err
 				}
@@ -163,7 +163,7 @@ var (
 				return nil
 			}
 			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Errorf(ctx, "%s BeforeSave err: %v", c.String(), err)
+				c.Options().Logger.Error(ctx, c.String()+" BeforeSave error "+err.Error())
 				if !c.Options().AllowFail {
 					return err
 				}
@@ -178,7 +178,7 @@ var (
 				return nil
 			}
 			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Errorf(ctx, "%s AfterSave err: %v", c.String(), err)
+				c.Options().Logger.Error(ctx, c.String()+" AfterSave error "+err.Error())
 				if !c.Options().AllowFail {
 					return err
 				}
@@ -193,7 +193,7 @@ var (
 				return nil
 			}
 			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Errorf(ctx, "%s BeforeInit err: %v", c.String(), err)
+				c.Options().Logger.Error(ctx, c.String()+" BeforeInit error "+err.Error())
 				if !c.Options().AllowFail {
 					return err
 				}
@@ -208,7 +208,7 @@ var (
 				return nil
 			}
 			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Errorf(ctx, "%s AfterInit err: %v", c.String(), err)
+				c.Options().Logger.Error(ctx, c.String()+" AfterInit error "+err.Error())
 				if !c.Options().AllowFail {
 					return err
 				}
diff --git a/register/memory.go b/register/memory.go
index 6c86ce2a..8cd75935 100644
--- a/register/memory.go
+++ b/register/memory.go
@@ -63,7 +63,7 @@ func (m *memory) ttlPrune() {
 					for id, n := range record.Nodes {
 						if n.TTL != 0 && time.Since(n.LastSeen) > n.TTL {
 							if m.opts.Logger.V(logger.DebugLevel) {
-								m.opts.Logger.Debugf(m.opts.Context, "Register TTL expired for node %s of service %s", n.ID, service)
+								m.opts.Logger.Debug(m.opts.Context, "RegisterTTL expired for node "+n.ID+" of service "+service)
 							}
 							delete(m.records[domain][service][version].Nodes, id)
 						}
@@ -150,7 +150,7 @@ func (m *memory) Register(ctx context.Context, s *Service, opts ...RegisterOptio
 	if _, ok := srvs[s.Name][s.Version]; !ok {
 		srvs[s.Name][s.Version] = r
 		if m.opts.Logger.V(logger.DebugLevel) {
-			m.opts.Logger.Debugf(m.opts.Context, "Register added new service: %s, version: %s", s.Name, s.Version)
+			m.opts.Logger.Debug(m.opts.Context, "register added new service: "+s.Name+", version "+s.Version)
 		}
 		m.records[options.Domain] = srvs
 		go m.sendEvent(&Result{Action: "create", Service: s})
@@ -190,14 +190,14 @@ func (m *memory) Register(ctx context.Context, s *Service, opts ...RegisterOptio
 
 	if addedNodes {
 		if m.opts.Logger.V(logger.DebugLevel) {
-			m.opts.Logger.Debugf(m.opts.Context, "Register added new node to service: %s, version: %s", s.Name, s.Version)
+			m.opts.Logger.Debug(m.opts.Context, "register added new node to service: "+s.Name+", version "+s.Version)
 		}
 		go m.sendEvent(&Result{Action: "update", Service: s})
 	} else {
 		// refresh TTL and timestamp
 		for _, n := range s.Nodes {
 			if m.opts.Logger.V(logger.DebugLevel) {
-				m.opts.Logger.Debugf(m.opts.Context, "Updated registration for service: %s, version: %s", s.Name, s.Version)
+				m.opts.Logger.Debug(m.opts.Context, "updated registration for service: "+s.Name+", version "+s.Version)
 			}
 			srvs[s.Name][s.Version].Nodes[n.ID].TTL = options.TTL
 			srvs[s.Name][s.Version].Nodes[n.ID].LastSeen = time.Now()
@@ -242,7 +242,7 @@ func (m *memory) Deregister(ctx context.Context, s *Service, opts ...DeregisterO
 	for _, n := range s.Nodes {
 		if _, ok := version.Nodes[n.ID]; ok {
 			if m.opts.Logger.V(logger.DebugLevel) {
-				m.opts.Logger.Debugf(m.opts.Context, "Register removed node from service: %s, version: %s", s.Name, s.Version)
+				m.opts.Logger.Debug(m.opts.Context, "register removed node from service: "+s.Name+", version "+s.Version)
 			}
 			delete(version.Nodes, n.ID)
 		}
@@ -263,7 +263,7 @@ func (m *memory) Deregister(ctx context.Context, s *Service, opts ...DeregisterO
 		go m.sendEvent(&Result{Action: "delete", Service: s})
 
 		if m.opts.Logger.V(logger.DebugLevel) {
-			m.opts.Logger.Debugf(m.opts.Context, "Register removed service: %s", s.Name)
+			m.opts.Logger.Debug(m.opts.Context, "register removed service: "+s.Name)
 		}
 		return nil
 	}
@@ -272,7 +272,7 @@ func (m *memory) Deregister(ctx context.Context, s *Service, opts ...DeregisterO
 	delete(m.records[options.Domain][s.Name], s.Version)
 	go m.sendEvent(&Result{Action: "delete", Service: s})
 	if m.opts.Logger.V(logger.DebugLevel) {
-		m.opts.Logger.Debugf(m.opts.Context, "Register removed service: %s, version: %s", s.Name, s.Version)
+		m.opts.Logger.Debug(m.opts.Context, "register removed service: "+s.Name+", version "+s.Version)
 	}
 
 	return nil
@@ -467,7 +467,7 @@ func serviceToRecord(s *Service, ttl time.Duration) *record {
 	}
 
 	endpoints := make([]*Endpoint, len(s.Endpoints))
-	for i, e := range s.Endpoints {
+	for i, e := range s.Endpoints { // TODO: vtolstov use copy
 		endpoints[i] = e
 	}
 
diff --git a/server/noop.go b/server/noop.go
index ebae5fe0..9b3355b9 100644
--- a/server/noop.go
+++ b/server/noop.go
@@ -122,7 +122,7 @@ func (n *noopServer) Register() error {
 
 	if !registered {
 		if config.Logger.V(logger.InfoLevel) {
-			config.Logger.Infof(n.opts.Context, "register [%s] Registering node: %s", config.Register.String(), service.Nodes[0].ID)
+			config.Logger.Info(n.opts.Context, "register ["+config.Register.String()+"] Registering node: "+service.Nodes[0].ID)
 		}
 	}
 
@@ -160,7 +160,7 @@ func (n *noopServer) Deregister() error {
 	}
 
 	if config.Logger.V(logger.InfoLevel) {
-		config.Logger.Infof(n.opts.Context, "deregistering node: %s", service.Nodes[0].ID)
+		config.Logger.Info(n.opts.Context, "deregistering node: "+service.Nodes[0].ID)
 	}
 
 	if err := DefaultDeregisterFunc(service, config); err != nil {
@@ -204,7 +204,7 @@ func (n *noopServer) Start() error {
 	config.Address = addr
 
 	if config.Logger.V(logger.InfoLevel) {
-		config.Logger.Infof(n.opts.Context, "server [noop] Listening on %s", config.Address)
+		config.Logger.Info(n.opts.Context, "server [noop] Listening on "+config.Address)
 	}
 
 	n.Lock()
@@ -217,13 +217,13 @@ func (n *noopServer) Start() error {
 	// nolint: nestif
 	if err := config.RegisterCheck(config.Context); err != nil {
 		if config.Logger.V(logger.ErrorLevel) {
-			config.Logger.Errorf(n.opts.Context, "server %s-%s register check error: %s", config.Name, config.ID, err)
+			config.Logger.Error(n.opts.Context, "server "+config.Name+"-"+config.ID+" register check error: "+err.Error())
 		}
 	} else {
 		// announce self to the world
 		if err := n.Register(); err != nil {
 			if config.Logger.V(logger.ErrorLevel) {
-				config.Logger.Errorf(n.opts.Context, "server register error: %v", err)
+				config.Logger.Error(n.opts.Context, "server register error: "+err.Error())
 			}
 		}
 	}
@@ -252,23 +252,23 @@ func (n *noopServer) Start() error {
 				// nolint: nestif
 				if rerr != nil && registered {
 					if config.Logger.V(logger.ErrorLevel) {
-						config.Logger.Errorf(n.opts.Context, "server %s-%s register check error: %s, deregister it", config.Name, config.ID, rerr)
+						config.Logger.Error(n.opts.Context, "server "+config.Name+"-"+config.ID+" register check error: ", rerr.Error())
 					}
 					// deregister self in case of error
 					if err := n.Deregister(); err != nil {
 						if config.Logger.V(logger.ErrorLevel) {
-							config.Logger.Errorf(n.opts.Context, "server %s-%s deregister error: %s", config.Name, config.ID, err)
+							config.Logger.Error(n.opts.Context, "server "+config.Name+"-"+config.ID+" deregister error: ", err.Error())
 						}
 					}
 				} else if rerr != nil && !registered {
 					if config.Logger.V(logger.ErrorLevel) {
-						config.Logger.Errorf(n.opts.Context, "server %s-%s register check error: %s", config.Name, config.ID, rerr)
+						config.Logger.Error(n.opts.Context, "server "+config.Name+"-"+config.ID+" register check error: ", rerr.Error())
 					}
 					continue
 				}
 				if err := n.Register(); err != nil {
 					if config.Logger.V(logger.ErrorLevel) {
-						config.Logger.Errorf(n.opts.Context, "server %s-%s register error: %s", config.Name, config.ID, err)
+						config.Logger.Error(n.opts.Context, "server "+config.Name+"-"+config.ID+" register error: ", err.Error())
 					}
 				}
 			// wait for exit
@@ -280,7 +280,7 @@ func (n *noopServer) Start() error {
 		// deregister self
 		if err := n.Deregister(); err != nil {
 			if config.Logger.V(logger.ErrorLevel) {
-				config.Logger.Errorf(n.opts.Context, "server deregister error: ", err)
+				config.Logger.Error(n.opts.Context, "server deregister error: "+err.Error())
 			}
 		}
 
diff --git a/service.go b/service.go
index 9d8e6c21..fe1d950b 100644
--- a/service.go
+++ b/service.go
@@ -258,7 +258,7 @@ func (s *service) Start() error {
 	}
 
 	if config.Loggers[0].V(logger.InfoLevel) {
-		config.Loggers[0].Infof(s.opts.Context, "starting [service] %s version %s", s.Options().Name, s.Options().Version)
+		config.Loggers[0].Info(s.opts.Context, "starting [service] "+s.Options().Name+" version "+s.Options().Version)
 	}
 
 	if len(s.opts.Servers) == 0 {
@@ -304,7 +304,7 @@ func (s *service) Stop() error {
 	s.RUnlock()
 
 	if config.Loggers[0].V(logger.InfoLevel) {
-		config.Loggers[0].Infof(s.opts.Context, "stoppping [service] %s", s.Name())
+		config.Loggers[0].Info(s.opts.Context, "stoppping [service] "+s.Name())
 	}
 
 	var err error
diff --git a/util/id/id.go b/util/id/id.go
index 8bd9c0d8..5d110312 100644
--- a/util/id/id.go
+++ b/util/id/id.go
@@ -71,7 +71,7 @@ func New(opts ...Option) (string, error) {
 func Must(opts ...Option) string {
 	id, err := New(opts...)
 	if err != nil {
-		logger.Fatal(context.TODO(), err)
+		logger.Fatal(context.TODO(), err.Error())
 	}
 	return id
 }