configSizeBytes = monitoring.NewDistribution(
		"pilot_xds_config_size_bytes",
		"Distribution of configuration sizes pushed to clients",
		// Important boundaries: 10K, 1M, 4M, 10M, 40M
		// 4M default limit for gRPC, 10M config will start to strain system,
		// 40M is likely upper-bound on config sizes supported.
		[]float64{1, 10000, 1000000, 4000000, 10000000, 40000000},

			Buckets:        []float64{0.005, 0.025, 0.1, 0.5, 1, 2.5, 10, 30, 60, 120, 180, 240}, // 5ms to 4m
			StabilityLevel: metrics.ALPHA,
		},
	)
)

var registerMetrics sync.Once

// Register registers TaintEvictionController metrics.
func Register() {
	registerMetrics.Do(func() {

        "1 minute"          | "10 minutes"        | minutes(1)                          | "1m"
        "1 minute"          | "10 minutes"        | minutes(4.21234)                    | "4m 12s"
        "10 minutes"        | "1 hour"            | minutes(42.1234)                    | "42m 7s"
        "10 minutes"        | "1 hour"            | minutes(60)                         | "1h"

	const (
		GOAL   = 0
		COUNT  = 1
		ALLOCS = 2
		FREES  = 3
	)

	// Assumptions and observations of Go's garbage collector, as of Go 1.17-1.20:

	// - the initial heap goal is 4M, by fiat.  It is possible for Go to start
	//   with a heap as small as 512k, so this may change in the future.

	// - except for the first heap goal, heap goal is a function of