kubernetes/vendor/github.com/prometheus/client_golang/prometheus/go_collector.go

// goRuntimeMemStats provides the metrics initially provided by runtime.ReadMemStats.
// From Go 1.17 those similar (and better) statistics are provided by runtime/metrics, so
// while eval closure works on runtime.MemStats, the struct from Go 1.17+ is
// populated using runtime/metrics.
func goRuntimeMemStats() memStatsMetrics { … }

type baseGoCollector …

func newBaseGoCollector() baseGoCollector { … }

// Describe returns all descriptions of the collector.
func (c *baseGoCollector) Describe(ch chan<- *Desc) { … }

// Collect returns the current state of all metrics of the collector.
func (c *baseGoCollector) Collect(ch chan<- Metric) { … }

func memstatNamespace(s string) string { … }

type memStatsMetrics …