PauseQuantiles []time.Duration
}

// ReadGCStats reads statistics about garbage collection into stats.
// The number of entries in the pause history is system-dependent;
// stats.Pause slice will be reused if large enough, reallocated otherwise.
// ReadGCStats may use the full capacity of the stats.Pause slice.
// If stats.PauseQuantiles is non-empty, ReadGCStats fills it with quantiles

	gcStats := debug.GCStats{
		// If stats.PauseQuantiles is non-empty, ReadGCStats fills
		// it with quantiles summarizing the distribution of pause time.
		// For example, if len(stats.PauseQuantiles) is 5, it will be
		// filled with the minimum, 25%, 50%, 75%, and maximum pause times.
		PauseQuantiles: make([]time.Duration, 5),
	}
	debug.ReadGCStats(&gcStats)
	// Truncate GC stats to max 5 entries.
	if len(gcStats.PauseEnd) > 5 {

	// compatibility issues. copy will copy the minimum amount
	// of values between the two of them.
	copy(stats.BySize[:], bySize[:])
}

//go:linkname readGCStats runtime/debug.readGCStats
func readGCStats(pauses *[]uint64) {
	systemstack(func() {
		readGCStats_m(pauses)
	})
}

// readGCStats_m must be called on the system stack because it acquires the heap

/*
Package metrics provides a stable interface to access implementation-defined
metrics exported by the Go runtime. This package is similar to existing functions
like [runtime.ReadMemStats] and [runtime/debug.ReadGCStats], but significantly more general.

The set of metrics defined by this package may evolve as the runtime itself
evolves, and also enables variation across Go implementations, whose relevant
metric sets may not intersect.

		{"Module.Replace", Field, 12},
		{"Module.Sum", Field, 12},
		{"Module.Version", Field, 12},
		{"ParseBuildInfo", Func, 18},
		{"PrintStack", Func, 0},
		{"ReadBuildInfo", Func, 12},
		{"ReadGCStats", Func, 1},
		{"SetGCPercent", Func, 1},
		{"SetMaxStack", Func, 2},
		{"SetMaxThreads", Func, 2},
		{"SetMemoryLimit", Func, 19},
		{"SetPanicOnFault", Func, 3},
		{"SetTraceback", Func, 6},