Werk #13826: logwatch plugin - Add the option to filter out consecutive duplicate lines

Component	Checks & agents
Title	logwatch plugin - Add the option to filter out consecutive duplicate lines
Date	Mar 8, 2022
Checkmk Edition	Checkmk Raw (CRE)
Checkmk Version	2.1.0b4 2.2.0b1
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed

This werk extends the logwatch agent plugin with an option to filter out consecutive duplicate messages in the agent output.

If the option is enabled, identical consecutive messages will be filtered out. As soon as a different message comes in between, the filter will be reset.

Example:

Without filtering:

Message_Itself

Message_Again

With filtering:

Message_Itself

[the above message was repeated 2 times]

Message_Again

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