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I use Jenkins log recorders as described in docs: https://www.jenkins.io/doc/book/system-administration/viewing-logs/
It works, but log is only about 255 lines long, which is too short for my processing.
Newest lines are shown, I cant reach older logs, so I dont know what happened in the beginning.
How do I increase this size? I would like to keep at least 1MB of data.

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I'm pretty sure this Jenkins system property will do the trick:

hudson.util.RingBufferLogHandler.defaultSize

tuning

Since: 1.563

Default: 256

Description: Number of log entries in loggers available on the UI at /log/

You can also custom Configure Loggers for Jenkins or create a logger in Jenkins for troubleshooting and diagnostic information that capture specifics you are looking for.

Additional references:
JENKINS - Logging
JENKINS - Logger Configuration

Or, if you are the admin, you should be able simply to scan the logs on the filesystem. Review what log rotation options and retention you may have.

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