turns gRPC latency histogram into a toggleable option

so that custom builds of SpiceDB can decide to enable or disable it,
as with the new version of the grpc-ecosystem prometheus middleware
does not provide enough granularity.

go.mod

@@ -130,7 +130,7 @@ require (
 	github.com/bits-and-blooms/bitset v1.10.0 // indirect
 	github.com/bkielbasa/cyclop v1.2.1 // indirect
 	github.com/blizzy78/varnamelen v0.8.0 // indirect
-	github.com/bombsimon/wsl/v3 v3.4.0 // indirect
+	github.com/bombsimon/wsl/v4 v4.2.1 // indirect
 	github.com/breml/bidichk v0.2.7 // indirect
 	github.com/breml/errchkjson v0.3.6 // indirect
 	github.com/butuzov/ireturn v0.3.0 // indirect
@@ -178,6 +178,7 @@ require (
 	github.com/go-toolsmith/astp v1.1.0 // indirect
 	github.com/go-toolsmith/strparse v1.1.0 // indirect
 	github.com/go-toolsmith/typep v1.1.0 // indirect
+	github.com/go-viper/mapstructure/v2 v2.0.0-alpha.1 // indirect
 	github.com/go-xmlfmt/xmlfmt v1.1.2 // indirect
 	github.com/gobwas/glob v0.2.3 // indirect
 	github.com/gofrs/flock v0.8.1 // indirect
@@ -219,6 +220,7 @@ require (
 	github.com/jgautheron/goconst v1.7.0 // indirect
 	github.com/jingyugao/rowserrcheck v1.1.1 // indirect
 	github.com/jirfag/go-printf-func-name v0.0.0-20200119135958-7558a9eaa5af // indirect
+	github.com/jjti/go-spancheck v0.5.2 // indirect
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/joho/godotenv v1.5.1 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
@@ -318,6 +320,7 @@ require (
 	github.com/yeya24/promlinter v0.2.0 // indirect
 	github.com/ykadowak/zerologlint v0.1.5 // indirect
 	gitlab.com/bosi/decorder v0.4.1 // indirect
+	go-simpler.org/musttag v0.8.0 // indirect
 	go-simpler.org/sloglint v0.4.0 // indirect
 	go.opentelemetry.io/contrib/propagators/b3 v1.20.0 // indirect
 	go.opentelemetry.io/contrib/propagators/ot v1.20.0 // indirect
@@ -326,7 +329,6 @@ require (
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.22.0 // indirect
 	go.opentelemetry.io/otel/metric v1.24.0 // indirect
 	go.opentelemetry.io/proto/otlp v1.0.0 // indirect
-	go.tmz.dev/musttag v0.7.2 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	go.uber.org/zap v1.26.0 // indirect
 	golang.org/x/crypto v0.21.0 // indirect

go.sum

@@ -137,7 +137,6 @@ github.com/bkielbasa/cyclop v1.2.1 h1:AeF71HZDob1P2/pRm1so9cd1alZnrpyc4q2uP2l0gJ
 github.com/bkielbasa/cyclop v1.2.1/go.mod h1:K/dT/M0FPAiYjBgQGau7tz+3TMh4FWAEqlMhzFWCrgM=
 github.com/blizzy78/varnamelen v0.8.0 h1:oqSblyuQvFsW1hbBHh1zfwrKe3kcSj0rnXkKzsQ089M=
 github.com/blizzy78/varnamelen v0.8.0/go.mod h1:V9TzQZ4fLJ1DSrjVDfl89H7aMnTvKkApdHeyESmyR7k=
-github.com/bombsimon/wsl/v3 v3.4.0/go.mod h1:KkIB+TXkqy6MvK9BDZVbZxKNYsE1/oLRJbIFtf14qqo=
 github.com/bombsimon/wsl/v4 v4.2.1 h1:Cxg6u+XDWff75SIFFmNsqnIOgob+Q9hG6y/ioKbRFiM=
 github.com/bombsimon/wsl/v4 v4.2.1/go.mod h1:Xu/kDxGZTofQcDGCtQe9KCzhHphIe0fDuyWTxER9Feo=
 github.com/breml/bidichk v0.2.7 h1:dAkKQPLl/Qrk7hnP6P+E0xOodrq8Us7+U0o4UBOAlQY=
@@ -916,7 +915,6 @@ go.opentelemetry.io/otel/trace v1.24.0 h1:CsKnnL4dUAr/0llH9FKuc698G04IrpWV0MQA/Y
 go.opentelemetry.io/otel/trace v1.24.0/go.mod h1:HPc3Xr/cOApsBI154IU0OI0HJexz+aw5uPdbs3UCjNU=
 go.opentelemetry.io/proto/otlp v1.0.0 h1:T0TX0tmXU8a3CbNXzEKGeU5mIVOdf0oykP+u2lIVU/I=
 go.opentelemetry.io/proto/otlp v1.0.0/go.mod h1:Sy6pihPLfYHkr3NkUbEhGHFhINUSI/v80hjKIs5JXpM=
-go.tmz.dev/musttag v0.7.2/go.mod h1:m6q5NiiSKMnQYokefa2xGoyoXnrswCbJ0AWYzf4Zs28=
 go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
 go.uber.org/atomic v1.9.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
 go.uber.org/atomic v1.11.0 h1:ZvwS0R+56ePWxUNi+Atn9dWONBPp/AUETXlHW0DxSjE=

pkg/cmd/devtools.go

@@ -56,7 +56,7 @@ func NewDevtoolsCommand(programName string) *cobra.Command {
 }
 
 func runfunc(cmd *cobra.Command, _ []string) error {
-	grpcUnaryInterceptor, _ := server.GRPCMetrics()
+	grpcUnaryInterceptor, _ := server.GRPCMetrics(false)
 	grpcBuilder := grpcServiceBuilder()
 	grpcServer, err := grpcBuilder.ServerFromFlags(cmd,
 		grpc.ChainUnaryInterceptor(

pkg/cmd/server/defaults.go

@@ -163,6 +163,7 @@ type MiddlewareOption struct {
 	ds                    datastore.Datastore
 	enableRequestLog      bool
 	enableResponseLog     bool
+	disableGRPCHistogram  bool
 }
 
 // gRPCMetricsUnaryInterceptor creates the default prometheus metrics interceptor for unary gRPCs
@@ -174,9 +175,9 @@ var gRPCMetricsStreamingInterceptor grpc.StreamServerInterceptor
 var serverMetricsOnce sync.Once
 
 // GRPCMetrics returns the interceptors used for the default gRPC metrics from grpc-ecosystem/go-grpc-middleware
-func GRPCMetrics() (grpc.UnaryServerInterceptor, grpc.StreamServerInterceptor) {
+func GRPCMetrics(disableLatencyHistogram bool) (grpc.UnaryServerInterceptor, grpc.StreamServerInterceptor) {
 	serverMetricsOnce.Do(func() {
-		gRPCMetricsUnaryInterceptor, gRPCMetricsStreamingInterceptor = createServerMetrics()
+		gRPCMetricsUnaryInterceptor, gRPCMetricsStreamingInterceptor = createServerMetrics(disableLatencyHistogram)
 	})
 
 	return gRPCMetricsUnaryInterceptor, gRPCMetricsStreamingInterceptor
@@ -198,7 +199,7 @@ func doesNotMatchRoute(route string) func(_ context.Context, c interceptors.Call
 
 // DefaultUnaryMiddleware generates the default middleware chain used for the public SpiceDB Unary gRPC methods
 func DefaultUnaryMiddleware(opts MiddlewareOption) (*MiddlewareChain[grpc.UnaryServerInterceptor], error) {
-	grpcMetricsUnaryInterceptor, _ := GRPCMetrics()
+	grpcMetricsUnaryInterceptor, _ := GRPCMetrics(opts.disableGRPCHistogram)
 	chain, err := NewMiddlewareChain([]ReferenceableMiddleware[grpc.UnaryServerInterceptor]{
 		NewUnaryMiddleware().
 			WithName(DefaultMiddlewareRequestID).
@@ -276,7 +277,7 @@ func DefaultUnaryMiddleware(opts MiddlewareOption) (*MiddlewareChain[grpc.UnaryS
 
 // DefaultStreamingMiddleware generates the default middleware chain used for the public SpiceDB Streaming gRPC methods
 func DefaultStreamingMiddleware(opts MiddlewareOption) (*MiddlewareChain[grpc.StreamServerInterceptor], error) {
-	_, grpcMetricsStreamingInterceptor := GRPCMetrics()
+	_, grpcMetricsStreamingInterceptor := GRPCMetrics(opts.disableGRPCHistogram)
 	chain, err := NewMiddlewareChain([]ReferenceableMiddleware[grpc.StreamServerInterceptor]{
 		NewStreamMiddleware().
 			WithName(DefaultMiddlewareRequestID).
@@ -366,8 +367,10 @@ func determineEventsToLog(opts MiddlewareOption) grpclog.Option {
 }
 
 // DefaultDispatchMiddleware generates the default middleware chain used for the internal dispatch SpiceDB gRPC API
-func DefaultDispatchMiddleware(logger zerolog.Logger, authFunc grpcauth.AuthFunc, ds datastore.Datastore) ([]grpc.UnaryServerInterceptor, []grpc.StreamServerInterceptor) {
-	grpcMetricsUnaryInterceptor, grpcMetricsStreamingInterceptor := GRPCMetrics()
+func DefaultDispatchMiddleware(logger zerolog.Logger, authFunc grpcauth.AuthFunc, ds datastore.Datastore,
+	disableGRPCLatencyHistogram bool,
+) ([]grpc.UnaryServerInterceptor, []grpc.StreamServerInterceptor) {
+	grpcMetricsUnaryInterceptor, grpcMetricsStreamingInterceptor := GRPCMetrics(disableGRPCLatencyHistogram)
 	return []grpc.UnaryServerInterceptor{
 			requestid.UnaryServerInterceptor(requestid.GenerateIfMissing(true)),
 			logmw.UnaryServerInterceptor(logmw.ExtractMetadataField("x-request-id", "requestID")),
@@ -410,16 +413,17 @@ func InterceptorLogger(l zerolog.Logger) grpclog.Logger {
 }
 
 // initializes prometheus grpc interceptors with exemplar support enabled
-func createServerMetrics() (grpc.UnaryServerInterceptor, grpc.StreamServerInterceptor) {
-	srvMetrics := grpcprom.NewServerMetrics(
-		grpcprom.WithServerHandlingTimeHistogram(
+func createServerMetrics(disableHistogram bool) (grpc.UnaryServerInterceptor, grpc.StreamServerInterceptor) {
+	var opts []grpcprom.ServerMetricsOption
+	if !disableHistogram {
+		opts = append(opts, grpcprom.WithServerHandlingTimeHistogram(
 			grpcprom.WithHistogramBuckets([]float64{.001, .003, .006, .010, .018, .024, .032, .042, .056, .075, .100, .178, .316, .562, 1, 5}),
-		),
-	)
-
+		))
+	}
+	srvMetrics := grpcprom.NewServerMetrics(opts...)
 	// deliberately ignore if these metrics were already registered, so that
 	// custom builds of SpiceDB can register these metrics with custom labels
-	_ = prometheus.DefaultRegisterer.Register(srvMetrics)
+	_ = prometheus.Register(srvMetrics)
 
 	exemplarFromContext := func(ctx context.Context) prometheus.Labels {
 		if span := trace.SpanContextFromContext(ctx); span.IsSampled() {

pkg/cmd/server/server.go

@@ -131,6 +131,9 @@ type Config struct {
 	// Logs
 	EnableRequestLogs  bool `debugmap:"visible"`
 	EnableResponseLogs bool `debugmap:"visible"`
+
+	// Metrics
+	DisableGRPCLatencyHistogram bool `debugmap:"visible"`
 }
 
 type closeableStack struct {
@@ -289,9 +292,9 @@ func (c *Config) Complete(ctx context.Context) (RunnableServer, error) {
 
 	if len(c.DispatchUnaryMiddleware) == 0 && len(c.DispatchStreamingMiddleware) == 0 {
 		if c.GRPCAuthFunc == nil {
-			c.DispatchUnaryMiddleware, c.DispatchStreamingMiddleware = DefaultDispatchMiddleware(log.Logger, auth.MustRequirePresharedKey(c.PresharedSecureKey), ds)
+			c.DispatchUnaryMiddleware, c.DispatchStreamingMiddleware = DefaultDispatchMiddleware(log.Logger, auth.MustRequirePresharedKey(c.PresharedSecureKey), ds, c.DisableGRPCLatencyHistogram)
 		} else {
-			c.DispatchUnaryMiddleware, c.DispatchStreamingMiddleware = DefaultDispatchMiddleware(log.Logger, c.GRPCAuthFunc, ds)
+			c.DispatchUnaryMiddleware, c.DispatchStreamingMiddleware = DefaultDispatchMiddleware(log.Logger, c.GRPCAuthFunc, ds, c.DisableGRPCLatencyHistogram)
 		}
 	}
 
@@ -360,6 +363,7 @@ func (c *Config) Complete(ctx context.Context) (RunnableServer, error) {
 		ds,
 		c.EnableRequestLogs,
 		c.EnableResponseLogs,
+		c.DisableGRPCLatencyHistogram,
 	}
 	defaultUnaryMiddlewareChain, err := DefaultUnaryMiddleware(opts)
 	if err != nil {

pkg/cmd/server/server_test.go

@@ -230,7 +230,7 @@ func TestModifyUnaryMiddleware(t *testing.T) {
 		},
 	}}
 
-	opt := MiddlewareOption{logging.Logger, nil, false, nil, nil, false, false}
+	opt := MiddlewareOption{logging.Logger, nil, false, nil, nil, false, false, false}
 	defaultMw, err := DefaultUnaryMiddleware(opt)
 	require.NoError(t, err)
 
@@ -256,7 +256,7 @@ func TestModifyStreamingMiddleware(t *testing.T) {
 		},
 	}}
 
-	opt := MiddlewareOption{logging.Logger, nil, false, nil, nil, false, false}
+	opt := MiddlewareOption{logging.Logger, nil, false, nil, nil, false, false, false}
 	defaultMw, err := DefaultStreamingMiddleware(opt)
 	require.NoError(t, err)