kubernetes/vendor/go.etcd.io/etcd/client/pkg/v3/systemd/journal.go

// DialJournal returns no error if the process can dial journal socket.
// Returns an error if dial failed, which indicates journald is not available
// (e.g. run embedded etcd as docker daemon).
// Reference: https://github.com/coreos/go-systemd/blob/master/journal/journal.go.
func DialJournal() error { … }