add more labels to RequestRecorder (#12727)

Co-authored-by: Daniel Nephin <dnephin@hashicorp.com>
Signed-off-by: FFMMM <FFMMM@users.noreply.github.com>

.changelog/12727.txt

@@ -0,0 +1,4 @@
+```release-note:improvement
+telemetry: Add new `leader` label to `consul.rpc.server.call` and optional `target_datacenter`, `locality`,
+`allow_stale`, and `blocking` optional labels.
+```

agent/consul/options.go

@@ -25,7 +25,7 @@ type Deps struct {
 	// the rpc server.
 	GetNetRPCInterceptorFunc func(recorder *middleware.RequestRecorder) rpc.ServerServiceCallInterceptor
 	// NewRequestRecorderFunc provides a middleware.RequestRecorder for the server to use; it cannot be nil
-	NewRequestRecorderFunc func(logger hclog.Logger) *middleware.RequestRecorder
+	NewRequestRecorderFunc func(logger hclog.Logger, isLeader func() bool, localDC string) *middleware.RequestRecorder
 	EnterpriseDeps
 }
 

agent/consul/server.go

@@ -386,24 +386,6 @@ func NewServer(config *Config, flat Deps, publicGRPCServer *grpc.Server) (*Serve
 	serverLogger := flat.Logger.NamedIntercept(logging.ConsulServer)
 	loggers := newLoggerStore(serverLogger)
 
-	var recorder *middleware.RequestRecorder
-	if flat.NewRequestRecorderFunc == nil {
-		return nil, fmt.Errorf("cannot initialize server without an RPC request recorder provider")
-	}
-	recorder = flat.NewRequestRecorderFunc(serverLogger)
-	if recorder == nil {
-		return nil, fmt.Errorf("cannot initialize server without a non nil RPC request recorder")
-	}
-
-	var rpcServer, insecureRPCServer *rpc.Server
-	if flat.GetNetRPCInterceptorFunc == nil {
-		rpcServer = rpc.NewServer()
-		insecureRPCServer = rpc.NewServer()
-	} else {
-		rpcServer = rpc.NewServerWithOpts(rpc.WithServerServiceCallInterceptor(flat.GetNetRPCInterceptorFunc(recorder)))
-		insecureRPCServer = rpc.NewServerWithOpts(rpc.WithServerServiceCallInterceptor(flat.GetNetRPCInterceptorFunc(recorder)))
-	}
-
 	eventPublisher := stream.NewEventPublisher(10 * time.Second)
 
 	fsmDeps := fsm.Deps{
@@ -427,9 +409,6 @@ func NewServer(config *Config, flat Deps, publicGRPCServer *grpc.Server) (*Serve
 		leaveCh:                 make(chan struct{}),
 		reconcileCh:             make(chan serf.Member, reconcileChSize),
 		router:                  flat.Router,
-		rpcRecorder:             recorder,
-		rpcServer:               rpcServer,
-		insecureRPCServer:       insecureRPCServer,
 		tlsConfigurator:         flat.TLSConfigurator,
 		publicGRPCServer:        publicGRPCServer,
 		reassertLeaderCh:        make(chan chan error),
@@ -443,6 +422,26 @@ func NewServer(config *Config, flat Deps, publicGRPCServer *grpc.Server) (*Serve
 		publisher:               eventPublisher,
 	}
 
+	var recorder *middleware.RequestRecorder
+	if flat.NewRequestRecorderFunc != nil {
+		recorder = flat.NewRequestRecorderFunc(serverLogger, s.IsLeader, s.config.Datacenter)
+	} else {
+		return nil, fmt.Errorf("cannot initialize server without an RPC request recorder provider")
+	}
+	if recorder == nil {
+		return nil, fmt.Errorf("cannot initialize server with a nil RPC request recorder")
+	}
+
+	if flat.GetNetRPCInterceptorFunc == nil {
+		s.rpcServer = rpc.NewServer()
+		s.insecureRPCServer = rpc.NewServer()
+	} else {
+		s.rpcServer = rpc.NewServerWithOpts(rpc.WithServerServiceCallInterceptor(flat.GetNetRPCInterceptorFunc(recorder)))
+		s.insecureRPCServer = rpc.NewServerWithOpts(rpc.WithServerServiceCallInterceptor(flat.GetNetRPCInterceptorFunc(recorder)))
+	}
+
+	s.rpcRecorder = recorder
+
 	go s.publisher.Run(&lib.StopChannelContext{StopCh: s.shutdownCh})
 
 	if s.config.ConnectMeshGatewayWANFederationEnabled {

agent/consul/server_test.go

@@ -1172,7 +1172,8 @@ func TestServer_RPC_MetricsIntercept_Off(t *testing.T) {
 		// note that there will be "internal" net/rpc calls made
 		// that will still show up; those don't go thru the net/rpc interceptor;
 		// see consul.agent.rpc.middleware.RPCTypeInternal for context
-		deps.NewRequestRecorderFunc = func(logger hclog.Logger) *middleware.RequestRecorder {
+		deps.NewRequestRecorderFunc = func(logger hclog.Logger, isLeader func() bool, localDC string) *middleware.RequestRecorder {
+			// for the purposes of this test, we don't need isLeader or localDC
 			return &middleware.RequestRecorder{
 				Logger:       hclog.NewInterceptLogger(&hclog.LoggerOptions{}),
 				RecorderFunc: simpleRecorderFunc,
@@ -1205,7 +1206,8 @@ func TestServer_RPC_MetricsIntercept_Off(t *testing.T) {
 		// note that there will be "internal" net/rpc calls made
 		// that will still show up; those don't go thru the net/rpc interceptor;
 		// see consul.agent.rpc.middleware.RPCTypeInternal for context
-		deps.NewRequestRecorderFunc = func(logger hclog.Logger) *middleware.RequestRecorder {
+		deps.NewRequestRecorderFunc = func(logger hclog.Logger, isLeader func() bool, localDC string) *middleware.RequestRecorder {
+			// for the purposes of this test, we don't need isLeader or localDC
 			return &middleware.RequestRecorder{
 				Logger:       hclog.NewInterceptLogger(&hclog.LoggerOptions{}),
 				RecorderFunc: simpleRecorderFunc,
@@ -1265,14 +1267,14 @@ func TestServer_RPC_RequestRecorder(t *testing.T) {
 	t.Run("test nil RequestRecorder", func(t *testing.T) {
 		_, conf := testServerConfig(t)
 		deps := newDefaultDeps(t, conf)
-		deps.NewRequestRecorderFunc = func(logger hclog.Logger) *middleware.RequestRecorder {
+		deps.NewRequestRecorderFunc = func(logger hclog.Logger, isLeader func() bool, localDC string) *middleware.RequestRecorder {
 			return nil
 		}
 
 		s2, err := NewServer(conf, deps, grpc.NewServer())
 
 		require.Error(t, err, "need err when RequestRecorder is nil")
-		require.Equal(t, err.Error(), "cannot initialize server without a non nil RPC request recorder")
+		require.Equal(t, err.Error(), "cannot initialize server with a nil RPC request recorder")
 
 		t.Cleanup(func() {
 			if s2 != nil {
@@ -1308,7 +1310,8 @@ func TestServer_RPC_MetricsIntercept(t *testing.T) {
 	simpleRecorderFunc := func(key []string, val float32, labels []metrics.Label) {
 		storage[keyMakingFunc(key, labels)] = val
 	}
-	deps.NewRequestRecorderFunc = func(logger hclog.Logger) *middleware.RequestRecorder {
+	deps.NewRequestRecorderFunc = func(logger hclog.Logger, isLeader func() bool, localDC string) *middleware.RequestRecorder {
+		// for the purposes of this test, we don't need isLeader or localDC
 		return &middleware.RequestRecorder{
 			Logger:       hclog.NewInterceptLogger(&hclog.LoggerOptions{}),
 			RecorderFunc: simpleRecorderFunc,
@@ -1344,11 +1347,13 @@ func TestServer_RPC_MetricsIntercept(t *testing.T) {
 			{Name: "errored", Value: "false"},
 			{Name: "request_type", Value: "read"},
 			{Name: "rpc_type", Value: "test"},
+			{Name: "server_role", Value: "unreported"},
 		}
 
 		key := keyMakingFunc(middleware.OneTwelveRPCSummary[0].Name, expectedLabels)
 
 		if _, ok := storage[key]; !ok {
+			// the compound key will look like: "rpc+server+call+Status.Ping+false+read+test+unreported"
 			t.Fatalf("Did not find key %s in the metrics log, ", key)
 		}
 	})

agent/metrics_test.go

@@ -199,7 +199,7 @@ func TestAgent_OneTwelveRPCMetrics(t *testing.T) {
 		recordPromMetrics(t, a, respRec)
 
 		// make sure the labels exist for this metric
-		assertMetricExistsWithLabels(t, respRec, metricsPrefix+"_rpc_server_call", []string{"errored", "method", "request_type", "rpc_type"})
+		assertMetricExistsWithLabels(t, respRec, metricsPrefix+"_rpc_server_call", []string{"errored", "method", "request_type", "rpc_type", "leader"})
 		// make sure we see 3 Status.Ping metrics corresponding to the calls we made above
 		assertLabelWithValueForMetricExistsNTime(t, respRec, metricsPrefix+"_rpc_server_call", "method", "Status.Ping", 3)
 	})

agent/rpc/middleware/interceptors.go

@@ -35,31 +35,77 @@ var OneTwelveRPCSummary = []prometheus.SummaryDefinition{
 type RequestRecorder struct {
 	Logger         hclog.Logger
 	RecorderFunc   func(key []string, val float32, labels []metrics.Label)
+	serverIsLeader func() bool
+	localDC        string
 }
 
-func NewRequestRecorder(logger hclog.Logger) *RequestRecorder {
+func NewRequestRecorder(logger hclog.Logger, isLeader func() bool, localDC string) *RequestRecorder {
-	return &RequestRecorder{Logger: logger, RecorderFunc: metrics.AddSampleWithLabels}
+	return &RequestRecorder{
+		Logger:         logger,
+		RecorderFunc:   metrics.AddSampleWithLabels,
+		serverIsLeader: isLeader,
+		localDC:        localDC,
+	}
 }
 
 func (r *RequestRecorder) Record(requestName string, rpcType string, start time.Time, request interface{}, respErrored bool) {
 	elapsed := time.Since(start).Milliseconds()
 	reqType := requestType(request)
+	isLeader := r.getServerLeadership()
 
 	labels := []metrics.Label{
 		{Name: "method", Value: requestName},
 		{Name: "errored", Value: strconv.FormatBool(respErrored)},
 		{Name: "request_type", Value: reqType},
 		{Name: "rpc_type", Value: rpcType},
+		{Name: "leader", Value: isLeader},
 	}
 
+	labels = r.addOptionalLabels(request, labels)
+
 	// math.MaxInt64 < math.MaxFloat32 is true so we should be good!
 	r.RecorderFunc(metricRPCRequest, float32(elapsed), labels)
-	r.Logger.Trace(requestLogName,
+
-		"method", requestName,
+	labelsArr := flattenLabels(labels)
-		"errored", respErrored,
+	r.Logger.Trace(requestLogName, labelsArr...)
-		"request_type", reqType,
+
-		"rpc_type", rpcType,
+}
-		"elapsed", elapsed)
+
+func flattenLabels(labels []metrics.Label) []interface{} {
+
+	var labelArr []interface{}
+	for _, label := range labels {
+		labelArr = append(labelArr, label.Name, label.Value)
+	}
+
+	return labelArr
+}
+
+func (r *RequestRecorder) addOptionalLabels(request interface{}, labels []metrics.Label) []metrics.Label {
+	if rq, ok := request.(readQuery); ok {
+		labels = append(labels,
+			metrics.Label{
+				Name:  "allow_stale",
+				Value: strconv.FormatBool(rq.AllowStaleRead()),
+			},
+			metrics.Label{
+				Name:  "blocking",
+				Value: strconv.FormatBool(rq.GetMinQueryIndex() > 0),
+			})
+	}
+
+	if td, ok := request.(targetDC); ok {
+		requestDC := td.RequestDatacenter()
+		labels = append(labels, metrics.Label{Name: "target_datacenter", Value: requestDC})
+
+		if r.localDC == requestDC {
+			labels = append(labels, metrics.Label{Name: "locality", Value: "local"})
+		} else {
+			labels = append(labels, metrics.Label{Name: "locality", Value: "forwarded"})
+		}
+	}
+
+	return labels
 }
 
 func requestType(req interface{}) string {
@@ -77,6 +123,30 @@ func requestType(req interface{}) string {
 	return "unreported"
 }
 
+func (r *RequestRecorder) getServerLeadership() string {
+	if r.serverIsLeader != nil {
+		if r.serverIsLeader() {
+			return "true"
+		} else {
+			return "false"
+		}
+	}
+
+	// This logical branch should not happen. If it happens
+	// it means that we have not plumbed down a way to verify
+	// whether the server handling the request was a leader or not
+	return "unreported"
+}
+
+type readQuery interface {
+	GetMinQueryIndex() uint64
+	AllowStaleRead() bool
+}
+
+type targetDC interface {
+	RequestDatacenter() string
+}
+
 func GetNetRPCInterceptor(recorder *RequestRecorder) rpc.ServerServiceCallInterceptor {
 	return func(reqServiceMethod string, argv, replyv reflect.Value, handler func() error) {
 		reqStart := time.Now()

agent/rpc/middleware/interceptors_test.go

@@ -48,6 +48,8 @@ var simpleRecorderFunc = func(key []string, val float32, labels []metrics.Label)
 
 type readRequest struct{}
 type writeRequest struct{}
+type readReqWithTD struct{}
+type writeReqWithTD struct{}
 
 func (rr readRequest) IsRead() bool {
 	return true
@@ -57,75 +59,210 @@ func (wr writeRequest) IsRead() bool {
 	return false
 }
 
-// TestRequestRecorder_SimpleOK tests that the RequestRecorder can record a simple request.
+func (r readReqWithTD) IsRead() bool {
-func TestRequestRecorder_SimpleOK(t *testing.T) {
+	return true
-	t.Parallel()
+}
 
-	r := RequestRecorder{
+func (r readReqWithTD) RequestDatacenter() string {
-		Logger:       hclog.NewInterceptLogger(&hclog.LoggerOptions{}),
+	return "dc3"
-		RecorderFunc: simpleRecorderFunc,
+}
-	}
 
-	start := time.Now()
+func (r readReqWithTD) GetMinQueryIndex() uint64 {
-	r.Record("A.B", RPCTypeInternal, start, struct{}{}, false)
+	return 1
+}
+func (r readReqWithTD) AllowStaleRead() bool {
+	return false
+}
 
-	expectedLabels := []metrics.Label{
+func (w writeReqWithTD) IsRead() bool {
+	return false
+}
+
+func (w writeReqWithTD) RequestDatacenter() string {
+	return "dc2"
+}
+
+type testCase struct {
+	name string
+	// description is meant for human friendliness
+	description string
+	// requestName is encouraged to be unique across tests to
+	// avoid lock contention
+	requestName string
+	requestI    interface{}
+	rpcType     string
+	errored     bool
+	isLeader    func() bool
+	dc          string
+	// the first element in expectedLabels should be the method name
+	expectedLabels []metrics.Label
+}
+
+var testCases = []testCase{
+	{
+		name:        "simple ok",
+		description: "This is a simple happy path test case. We check for pass through and normal request processing",
+		requestName: "A.B",
+		requestI:    struct{}{},
+		rpcType:     RPCTypeInternal,
+		errored:     false,
+		dc:          "dc1",
+		expectedLabels: []metrics.Label{
 			{Name: "method", Value: "A.B"},
 			{Name: "errored", Value: "false"},
 			{Name: "request_type", Value: "unreported"},
 			{Name: "rpc_type", Value: RPCTypeInternal},
-	}
+			{Name: "leader", Value: "unreported"},
-
+		},
-	o := store.get(append(metricRPCRequest, expectedLabels[0].Value))
+	},
-	require.Equal(t, o.key, metricRPCRequest)
+	{
-	require.LessOrEqual(t, o.elapsed, float32(start.Sub(time.Now()).Milliseconds()))
+		name:        "simple ok errored",
-	require.Equal(t, o.labels, expectedLabels)
+		description: "Checks that the errored value is populated right.",
-}
+		requestName: "A.C",
-
+		requestI:    struct{}{},
-// TestRequestRecorder_ReadRequest tests that RequestRecorder can record a read request AND a responseErrored arg.
+		rpcType:     "test",
-func TestRequestRecorder_ReadRequest(t *testing.T) {
+		errored:     true,
-	t.Parallel()
+		dc:          "dc1",
-
+		expectedLabels: []metrics.Label{
-	r := RequestRecorder{
+			{Name: "method", Value: "A.C"},
-		Logger:       hclog.NewInterceptLogger(&hclog.LoggerOptions{}),
-		RecorderFunc: simpleRecorderFunc,
-	}
-
-	start := time.Now()
-
-	r.Record("B.A", RPCTypeNetRPC, start, readRequest{}, true)
-
-	expectedLabels := []metrics.Label{
-		{Name: "method", Value: "B.A"},
 			{Name: "errored", Value: "true"},
-		{Name: "request_type", Value: "read"},
+			{Name: "request_type", Value: "unreported"},
-		{Name: "rpc_type", Value: RPCTypeNetRPC},
+			{Name: "rpc_type", Value: "test"},
-	}
+			{Name: "leader", Value: "unreported"},
-
+		},
-	o := store.get(append(metricRPCRequest, expectedLabels[0].Value))
+	},
-	require.Equal(t, o.labels, expectedLabels)
+	{
-}
+		name:        "read request, rpc type internal",
-
+		description: "Checks for read request interface parsing",
-// TestRequestRecorder_WriteRequest tests that RequestRecorder can record a write request.
+		requestName: "B.C",
-func TestRequestRecorder_WriteRequest(t *testing.T) {
+		requestI:    readRequest{},
-	t.Parallel()
+		rpcType:     RPCTypeInternal,
-
+		errored:     false,
-	r := RequestRecorder{
+		dc:          "dc1",
-		Logger:       hclog.NewInterceptLogger(&hclog.LoggerOptions{}),
+		expectedLabels: []metrics.Label{
-		RecorderFunc: simpleRecorderFunc,
-	}
-
-	start := time.Now()
-
-	r.Record("B.C", RPCTypeNetRPC, start, writeRequest{}, true)
-
-	expectedLabels := []metrics.Label{
 			{Name: "method", Value: "B.C"},
-		{Name: "errored", Value: "true"},
+			{Name: "errored", Value: "false"},
+			{Name: "request_type", Value: "read"},
+			{Name: "rpc_type", Value: RPCTypeInternal},
+			{Name: "leader", Value: "unreported"},
+		},
+	},
+	{
+		name:        "write request, rpc type net/rpc",
+		description: "Checks for write request interface, different RPC type",
+		requestName: "D.E",
+		requestI:    writeRequest{},
+		rpcType:     RPCTypeNetRPC,
+		errored:     false,
+		dc:          "dc1",
+		expectedLabels: []metrics.Label{
+			{Name: "method", Value: "D.E"},
+			{Name: "errored", Value: "false"},
 			{Name: "request_type", Value: "write"},
 			{Name: "rpc_type", Value: RPCTypeNetRPC},
+			{Name: "leader", Value: "unreported"},
+		},
+	},
+	{
+		name:        "read request with blocking stale and target dc",
+		description: "Checks for locality, blocking status and target dc",
+		requestName: "E.F",
+		requestI:    readReqWithTD{},
+		rpcType:     RPCTypeNetRPC,
+		errored:     false,
+		dc:          "dc1",
+		expectedLabels: []metrics.Label{
+			{Name: "method", Value: "E.F"},
+			{Name: "errored", Value: "false"},
+			{Name: "request_type", Value: "read"},
+			{Name: "rpc_type", Value: RPCTypeNetRPC},
+			{Name: "leader", Value: "unreported"},
+			{Name: "allow_stale", Value: "false"},
+			{Name: "blocking", Value: "true"},
+			{Name: "target_datacenter", Value: "dc3"},
+			{Name: "locality", Value: "forwarded"},
+		},
+	},
+	{
+		name:        "write request with TD, locality local",
+		description: "Checks for write request with local forwarding and target dc",
+		requestName: "F.G",
+		requestI:    writeReqWithTD{},
+		rpcType:     RPCTypeNetRPC,
+		errored:     false,
+		dc:          "dc2",
+		expectedLabels: []metrics.Label{
+			{Name: "method", Value: "F.G"},
+			{Name: "errored", Value: "false"},
+			{Name: "request_type", Value: "write"},
+			{Name: "rpc_type", Value: RPCTypeNetRPC},
+			{Name: "leader", Value: "unreported"},
+			{Name: "target_datacenter", Value: "dc2"},
+			{Name: "locality", Value: "local"},
+		},
+	},
+	{
+		name:        "is leader",
+		description: "checks for is leader",
+		requestName: "G.H",
+		requestI:    struct{}{},
+		rpcType:     "test",
+		errored:     false,
+		isLeader: func() bool {
+			return true
+		},
+		expectedLabels: []metrics.Label{
+			{Name: "method", Value: "G.H"},
+			{Name: "errored", Value: "false"},
+			{Name: "request_type", Value: "unreported"},
+			{Name: "rpc_type", Value: "test"},
+			{Name: "leader", Value: "true"},
+		},
+	},
+	{
+		name:        "is not leader",
+		description: "checks for is not leader",
+		requestName: "H.I",
+		requestI:    struct{}{},
+		rpcType:     "test",
+		errored:     false,
+		isLeader: func() bool {
+			return false
+		},
+		expectedLabels: []metrics.Label{
+			{Name: "method", Value: "H.I"},
+			{Name: "errored", Value: "false"},
+			{Name: "request_type", Value: "unreported"},
+			{Name: "rpc_type", Value: "test"},
+			{Name: "leader", Value: "false"},
+		},
+	},
+}
+
+// TestRequestRecorder goes over all the parsing and reporting that RequestRecorder
+// is expected to perform.
+func TestRequestRecorder(t *testing.T) {
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+
+			r := RequestRecorder{
+				Logger:         hclog.NewInterceptLogger(&hclog.LoggerOptions{}),
+				RecorderFunc:   simpleRecorderFunc,
+				serverIsLeader: tc.isLeader,
+				localDC:        tc.dc,
 			}
 
-	o := store.get(append(metricRPCRequest, expectedLabels[0].Value))
+			start := time.Now()
-	require.Equal(t, o.labels, expectedLabels)
+			r.Record(tc.requestName, tc.rpcType, start, tc.requestI, tc.errored)
+
+			key := append(metricRPCRequest, tc.expectedLabels[0].Value)
+			o := store.get(key)
+
+			require.Equal(t, o.key, metricRPCRequest)
+			require.LessOrEqual(t, o.elapsed, float32(start.Sub(time.Now()).Milliseconds()))
+			require.Equal(t, o.labels, tc.expectedLabels)
+
+		})
+	}
 }