Function snapshotMetricsRegistryForTesting

experimental/stats/metricregistry.go:327–342

snapshotMetricsRegistryForTesting snapshots the global data of the metrics registry. Returns a cleanup function that sets the metrics registry to its original state.

()

// registry. Returns a cleanup function that sets the metrics registry to its
// original state.
func snapshotMetricsRegistryForTesting() func() {
	oldDefaultMetrics := DefaultMetrics
	oldRegisteredMetrics := registeredMetrics
	oldMetricsRegistry := metricsRegistry

	registeredMetrics = make(map[string]bool)
	metricsRegistry = make(map[string]*MetricDescriptor)
	maps.Copy(registeredMetrics, registeredMetrics)
	maps.Copy(metricsRegistry, metricsRegistry)

	return func() {
		DefaultMetrics = oldDefaultMetrics
		registeredMetrics = oldRegisteredMetrics
		metricsRegistry = oldMetricsRegistry
	}
}