The doc states, it may be possible to define new fields by applications.
What does it mean? Can one define arbitrary fields or are only those possible listed in the doc USER JOURNAL FIELDS?
If arbitrary fields are possible, how to define them then?
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Got it. Arbitrary fields are definitely possible.
You don't see them when $ journalctling by plain text.
You see your fields best by $ journalctl -ar -o json-pretty.
Which means
- showing all fields regardless whether they have non-printable characters in [-a]
- in reverse order - latest messages first [-r]
- by printing in json format [-o]
woodz
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