kubernetes/vendor/go.etcd.io/etcd/client/pkg/v3/logutil/zap_journal.go

// NewJournalWriter wraps "io.Writer" to redirect log output
// to the local systemd journal. If journald send fails, it fails
// back to writing to the original writer.
// The decode overhead is only <30µs per write.
// Reference: https://github.com/coreos/pkg/blob/master/capnslog/journald_formatter.go
func NewJournalWriter(wr io.Writer) (io.Writer, error) { … }

type journalWriter …

type logLine …

func (w *journalWriter) Write(p []byte) (int, error) { … }