common/reporter: simplify interface for collecting metrics

Remove unused methods and always collect scoped metrics. As a
side-effect, BioRIS gRPC metrics are now correctly scoped.

common/reporter/metrics.go

@@ -111,22 +111,7 @@ func (r *Reporter) MetricsHTTPHandler() http.Handler {
 	return r.metrics.HTTPHandler()
 }
 
-// MetricCollector register a custom collector.
-func (r *Reporter) MetricCollector(c prometheus.Collector) {
-	r.metrics.Collector(c)
-}
-
-// MetricCollectorForCurrentModule register a custom collector prefixed by the current module name.
-func (r *Reporter) MetricCollectorForCurrentModule(c prometheus.Collector) {
-	r.metrics.CollectorForCurrentModule(1, c)
-}
-
-// MetricDesc defines a new metric description.
-func (r *Reporter) MetricDesc(name, help string, variableLabels []string) *MetricDesc {
-	return r.metrics.Desc(1, name, help, variableLabels)
-}
-
-// MetricDesc2 defines a new metric description. It skips one callstack.
-func (r *Reporter) MetricDesc2(name, help string, variableLabels []string) *MetricDesc {
-	return r.metrics.Desc(2, name, help, variableLabels)
+// RegisterMetricCollector register a custom collector prefixed by the current module name.
+func (r *Reporter) RegisterMetricCollector(c prometheus.Collector) {
+	r.metrics.RegisterCollector(1, c)
 }

common/reporter/metrics/root.go

@@ -100,25 +100,9 @@ func (m *Metrics) Factory(skipCallstack int) *Factory {
 	return &factory
 }
 
-// Desc allocates and initializes and new metric description. Like for
-// factory, names are prefixed with the module name. Unlike factory,
-// there is no cache.
-func (m *Metrics) Desc(skipCallstack int, name, help string, variableLabels []string) *prometheus.Desc {
-	callStack := stack.Callers()
-	call := callStack[1+skipCallstack] // Trial and error, there is a test to check it works
-	prefix := getPrefix(call.FunctionName())
-	name = fmt.Sprintf("%s%s", prefix, name)
-	return prometheus.NewDesc(name, help, variableLabels, nil)
-}
-
-// Collector register a custom collector.
-func (m *Metrics) Collector(c prometheus.Collector) {
-	m.registry.MustRegister(c)
-}
-
-// CollectorForCurrentModule register a custom collector and prefix
+// RegisterCollector register a custom collector and prefix
 // everything with the module name.
-func (m *Metrics) CollectorForCurrentModule(skipCallStack int, c prometheus.Collector) {
+func (m *Metrics) RegisterCollector(skipCallStack int, c prometheus.Collector) {
 	callStack := stack.Callers()
 	call := callStack[1+skipCallStack] // Should be the same as above !
 	prefix := getPrefix(call.FunctionName())

common/reporter/metrics/root_test.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"net/http/httptest"
 	"runtime"
+	"slices"
 	"strings"
 	"testing"
 
@@ -51,14 +52,7 @@ func TestNew(t *testing.T) {
 		expecteds = append(expecteds, "process_open_fds")
 	}
 	for _, expected := range expecteds {
-		found := false
-		for _, line := range got {
-			if line == fmt.Sprintf("# TYPE %s gauge", expected) {
-				found = true
-				break
-			}
-		}
-		if !found {
+		if !slices.Contains(got, fmt.Sprintf("# TYPE %s gauge", expected)) {
 			t.Errorf("GET /api/v0/metrics missing: %s", expected)
 		}
 	}

common/reporter/metrics_test.go

@@ -180,9 +180,9 @@ func TestMetricCollector(t *testing.T) {
 	r := reporter.NewMock(t)
 
 	m := customMetrics{}
-	m.metric1 = r.MetricDesc("metric1", "Custom metric 1", nil)
-	m.metric2 = r.MetricDesc("metric2", "Custom metric 2", nil)
-	r.MetricCollector(m)
+	m.metric1 = prometheus.NewDesc("metric1", "Custom metric 1", nil, nil)
+	m.metric2 = prometheus.NewDesc("metric2", "Custom metric 2", nil, nil)
+	r.RegisterMetricCollector(m)
 
 	got := r.GetMetrics("akvorado_common_reporter_test_")
 	expected := map[string]string{

console/data/docs/99-changelog.md

@@ -25,6 +25,7 @@ the ownership of the Prometheus volume:
   #1900](https://github.com/akvorado/akvorado/pull/1900) for the consequences if
   you upgrade from a previous beta)
 - 💥 *docker*: switch from Prometheus to Grafana Alloy for scraping metrics
+- 🩹 *outlet*: move gRPC metrics for BioRIS provider in the routing namespace
 - 🌱 *docker*: enforce bridge name
 - 🌱 *docker*: add cAdvisor to the monitoring stack
 - 🌱 *docker*: update Prometheus to 3.5.0

inlet/kafka/root.go

@@ -87,7 +87,7 @@ func (c *Component) Start() error {
 			Msg("unable to create Kafka client")
 		return fmt.Errorf("unable to create Kafka client: %w", err)
 	}
-	c.r.MetricCollectorForCurrentModule(kafkaMetrics)
+	c.r.RegisterMetricCollector(kafkaMetrics)
 	c.kafkaClient = kafkaClient
 
 	// When dying, close the client

outlet/kafka/worker.go

@@ -35,7 +35,7 @@ func (c *realComponent) newClient(i int) (*kgo.Client, error) {
 			Msg("unable to create new client")
 		return nil, fmt.Errorf("unable to create Kafka client: %w", err)
 	}
-	c.r.MetricCollectorForCurrentModule(kafkaMetrics)
+	c.r.RegisterMetricCollector(kafkaMetrics)
 	return client, nil
 }
 

outlet/routing/provider/bioris/metrics.go

@@ -18,7 +18,7 @@ type metrics struct {
 
 // initMetrics initialize the metrics for the BMP component.
 func (p *Provider) initMetrics() {
-	p.r.MetricCollector(p.clientMetrics)
+	p.r.RegisterMetricCollector(p.clientMetrics)
 	p.metrics.risUp = p.r.GaugeVec(
 		reporter.GaugeOpts{
 			Name: "connection_up",

outlet/routing/provider/bioris/root_test.go

@@ -462,7 +462,7 @@ func TestBioRIS(t *testing.T) {
 	}
 
 	for try := 2; try >= 0; try-- {
-		gotMetrics := r.GetMetrics("akvorado_outlet_routing_provider_bioris_")
+		gotMetrics := r.GetMetrics("akvorado_outlet_routing_provider_bioris_", "-grpc_client")
 		expectedMetrics := map[string]string{
 			// connection_up may take a bit of time
 			fmt.Sprintf(`connection_up{ris="%s"}`, addr):                                     "1",
@@ -506,6 +506,10 @@ func TestNonWorkingBioRIS(t *testing.T) {
 	expectedMetrics := map[string]string{
 		`connection_up{ris="ris.invalid:1000"}`: "0",
 		`connection_up{ris="192.0.2.10:1000"}`:  "0",
+		`grpc_client_handled_total{grpc_code="Unavailable",grpc_method="GetRouters",grpc_service="bio.ris.RoutingInformationService",grpc_type="unary"}`: "2",
+		`grpc_client_msg_received_total{grpc_method="GetRouters",grpc_service="bio.ris.RoutingInformationService",grpc_type="unary"}`:                    "2",
+		`grpc_client_msg_sent_total{grpc_method="GetRouters",grpc_service="bio.ris.RoutingInformationService",grpc_type="unary"}`:                        "2",
+		`grpc_client_started_total{grpc_method="GetRouters",grpc_service="bio.ris.RoutingInformationService",grpc_type="unary"}`:                         "2",
 	}
 	if diff := helpers.Diff(gotMetrics, expectedMetrics); diff != "" {
 		t.Errorf("Metrics (-got, +want):\n%s", diff)