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Add documentation for systemd per-service parsing configuration #1508

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Add documentation for systemd per-service parsing configuration #1508

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21 changes: 21 additions & 0 deletions pipeline/inputs/systemd.md
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Expand Up @@ -77,3 +77,24 @@ pipeline:
```
{% endtab %}
{% endtabs %}

### Parsing the MESSAGE field

By default, the _Systemd_ plugin logs all fields in the journal verbatim. If you want to parse the `MESSAGE` field, you can configure your service to specify a parser. For example, to parse the `MESSAGE` field as JSON, you can use something like the following systemd configuration:

```yaml
[Unit]
Description=my-service
After=network.target

[Service]
WorkingDirectory=/var/lib/my-service
ExecStart=/usr/sbin/my-service
Restart=always
LogExtraFields=FLUENT_BIT_PARSER=json

[Install]
WantedBy=multi-user.target
```

`LogExtraFields` will make the specified fields appear in the log output. The `Systemd` plugin will look for a `FLUENT_BIT_PARSER` field and use it to parse the `MESSAGE` field. If the parser is not found or parsing fails, the unparsed message is added to the log entry as if no parser was specified.