func runtime_getProfLabel() unsafe.Pointer
// SetGoroutineLabels sets the current goroutine's labels to match ctx.
+// A new goroutine inherits the labels of the goroutine that created it.
// This is a lower-level API than Do, which should be used instead when possible.
func SetGoroutineLabels(ctx context.Context) {
ctxLabels, _ := ctx.Value(labelContextKey{}).(*labelMap)
// Do calls f with a copy of the parent context with the
// given labels added to the parent's label map.
+// Goroutines spawned while executing f will inherit the augmented label-set.
// Each key/value pair in labels is inserted into the label map in the
// order provided, overriding any previous value for the same key.
// The augmented label map will be set for the duration of the call to f