fix lint errors (#937)

core/opentelemetry/agent.go

@@ -55,6 +55,5 @@ func StartAgent(c Config) {
 		otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
 
 		enabled.Set(true)
-
 	})
 }

core/opentelemetry/clientstream.go

@@ -67,7 +67,6 @@ func (w *clientStream) SendMsg(m interface{}) error {
 
 func (w *clientStream) Header() (metadata.MD, error) {
 	md, err := w.ClientStream.Header()
-
 	if err != nil {
 		w.sendStreamEvent(errorEvent, err)
 	}
@@ -77,7 +76,6 @@ func (w *clientStream) Header() (metadata.MD, error) {
 
 func (w *clientStream) CloseSend() error {
 	err := w.ClientStream.CloseSend()
-
 	if err != nil {
 		w.sendStreamEvent(errorEvent, err)
 	}

core/opentelemetry/tracer.go

@@ -24,7 +24,7 @@ func (s *metadataSupplier) Get(key string) string {
 	return values[0]
 }
 
-func (s *metadataSupplier) Set(key string, value string) {
+func (s *metadataSupplier) Set(key, value string) {
 	s.metadata.Set(key, value)
 }
 
@@ -35,6 +35,7 @@ func (s *metadataSupplier) Keys() []string {
 	}
 	return out
 }
+
 func Inject(ctx context.Context, p propagation.TextMapPropagator, metadata *metadata.MD) {
 	p.Inject(ctx, &metadataSupplier{
 		metadata: metadata,