continue
				}
				unLocker := bmg.LockAndSetBuckets(buckets)
				defer unLocker()
			}
			gatherers = append(gatherers, gatherer)
		}
	}

	if len(gatherers) == 0 {
		return notFoundHandler
	}

	return promhttp.HandlerFor(prometheus.Gatherers(gatherers), h.opts)
}

// ServeHTTP - implements http.Handler interface.
//

	// Helper function to register a collector and return a gatherer for it.
	mustRegister := func(c ...prometheus.Collector) prometheus.Gatherer {
		subRegistry := prometheus.NewRegistry()
		for _, col := range c {
			subRegistry.MustRegister(col)
		}
		r.MustRegister(subRegistry)
		return subRegistry
	}

	// Register all collectors and create gatherers for them.

	registry := prometheus.NewRegistry()

	logger.CriticalIf(GlobalContext, registry.Register(minioVersionInfo))

	logger.CriticalIf(GlobalContext, registry.Register(newMinioCollector()))

	gatherers := prometheus.Gatherers{
		prometheus.DefaultGatherer,
		registry,
	}

	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		tc, ok := r.Context().Value(mcontext.ContextTraceKey).(*mcontext.TraceCtxt)

	gatherers := prometheus.Gatherers{
		registry,
	}

	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		tc, ok := r.Context().Value(mcontext.ContextTraceKey).(*mcontext.TraceCtxt)
		if ok {
			tc.FuncName = funcName
			tc.ResponseRecorder.LogErrBody = true
		}

		mfs, err := gatherers.Gather()
		if err != nil && len(mfs) == 0 {

	"istio.io/istio/pkg/test"
	"istio.io/istio/pkg/test/util/retry"
)

type MetricsTest struct {
	t      test.Failer
	reg    prometheus.Gatherer
	deltas map[metricKey]float64
}

type metricKey struct {
	name  string
	attrs attribute.Set
}

var reg = lazy.New(func() (prometheus.Gatherer, error) {
	// TODO: do not use a global and/or add a way to reset (https://github.com/open-telemetry/opentelemetry-go/issues/4291)

// Returned is an HTTP handler that can be used to read metrics from.
func RegisterPrometheusExporter(reg prometheus.Registerer, gatherer prometheus.Gatherer) (http.Handler, error) {
	if reg == nil {
		reg = prometheus.DefaultRegisterer
	}
	if gatherer == nil {
		gatherer = prometheus.DefaultGatherer
	}
	promOpts := []otelprom.Option{

apiVersion: release-notes/v2
kind: feature
area: istioctl
releaseNotes:
- |

                        return defaultModelBuilder.readRawModel(gaBuildingRequest, problems);
                    } catch (ModelBuildingException e) {
                        // gathered with problem collector
                    }
                }
                return null;
            }

            private void loadFullReactor() {
                if (!fullReactorLoaded) {

                        return defaultModelBuilder.readRawModel(gaBuildingRequest, problems);
                    } catch (ModelBuilderException e) {
                        // gathered with problem collector
                    }
                }
                return null;
            }

            private void loadFullReactor() {
                if (!fullReactorLoaded) {

		&metrics.GaugeOpts{
			Namespace:      namespace,
			Name:           "version_info",
			Help:           "Etcd server's binary version",
			StabilityLevel: metrics.ALPHA,
		},
		[]string{"binary_version"})

	gatherer = &monitorGatherer{
		// Rewrite rules for etcd metrics that are exported by default.
		exported: map[string]*exportedMetric{
			// etcd 3.0 metric format for total grpc requests with renamed method and service labels.