add client observability middleware helper (#970)

Author: paulwe

logger/logger.go

@@ -418,7 +418,7 @@ func (l *zapLogger[T]) WithoutSampler() Logger {
 func (l *zapLogger[T]) WithDeferredValues() (Logger, DeferredFieldResolver) {
 	dup := *l
 	def, resolve := zaputil.NewDeferrer()
-	dup.deferred = append(dup.deferred, def)
+	dup.deferred = append(dup.deferred[0:len(dup.deferred):len(dup.deferred)], def)
 	dup.zap = dup.makeZap()
 	return &dup, resolve
 }

rpc/typed_api.go

@@ -100,6 +100,13 @@ func WithDefaultServerOptions(psrpcConfig PSRPCConfig, logger logger.Logger) psr
 	)
 }
 
+func WithClientObservability(logger logger.Logger) psrpc.ClientOption {
+	return psrpc.WithClientOptions(
+		middleware.WithClientMetrics(PSRPCMetricsObserver{}),
+		WithClientLogger(logger),
+	)
+}
+
 //go:generate go run github.com/maxbrunsfeld/counterfeiter/v6 -generate
 
 type TypedSignalClient = SignalClient[livekit.NodeID]