Function TestGatherDoesNotLeakGoroutines

prometheus/registry_test.go:1344–1367

(t *testing.T)

}

func TestGatherDoesNotLeakGoroutines(t *testing.T) {
	// Use goleak to verify that no unexpected goroutines are leaked during the test.
	defer goleak.VerifyNone(t)

	// Create a new Prometheus registry without any default collectors.
	reg := prometheus.NewRegistry()

	// Register 100 simple Gauge metrics with distinct names and constant labels.
	for i := 0; i < 100; i++ {
		reg.MustRegister(prometheus.NewGauge(prometheus.GaugeOpts{
			Name:        "test_metric_" + string(rune(i)),
			Help:        "Test metric",
			ConstLabels: prometheus.Labels{"id": string(rune(i))},
		}))
	}

	// Call Gather repeatedly to simulate stress and check for potential goroutine leaks.
	for i := 0; i < 1000; i++ {
		_, err := reg.Gather()
		if err != nil {
			t.Fatalf("unexpected error from Gather: %v", err)
		}
	}
}