gocollector: Add regex option to allow collection of debug runtime me…

…trics

Signed-off-by: Arthur Silva Sens <arthur.sens@coralogix.com>

prometheus/collectors/go_collector_latest.go

@@ -37,6 +37,9 @@ var (
 	// MetricsScheduler allows only scheduler metrics to be collected from Go runtime.
 	// e.g. go_sched_goroutines_goroutines
 	MetricsScheduler = GoRuntimeMetricsRule{regexp.MustCompile(`^/sched/.*`)}
+	// MetricsDebug allows only debug metrics to be collected from Go runtime.
+	// e.g. go_godebug_non_default_behavior_gocachetest_events_total
+	MetricsDebug = GoRuntimeMetricsRule{regexp.MustCompile(`^/godebug/.*`)}
 )
 
 // WithGoCollectorMemStatsMetricsDisabled disables metrics that is gathered in runtime.MemStats structure such as:

prometheus/collectors/go_collector_latest_test.go

@@ -105,6 +105,11 @@ func TestGoCollectorAllowList(t *testing.T) {
 			rules:    []GoRuntimeMetricsRule{MetricsScheduler},
 			expected: withSchedulerMetrics(),
 		},
+		{
+			name:     "allow debug",
+			rules:    []GoRuntimeMetricsRule{MetricsDebug},
+			expected: withDebugMetrics(),
+		},
 	} {
 		t.Run(test.name, func(t *testing.T) {
 			reg := prometheus.NewRegistry()