The wrapper.log files are controlled by the service wrapper we use; documentation on available logging properties here:https://wrapper.tanukisoftware.com/doc/english/props-logging.html
The system_logs.idb file is generated by Ignition and controlled through a custom logback appender; you can change logback.xml to change the retention target from the default ~50,000 events:
The SQlite-based log appender that the gateway webpage uses is controlled in the logback.xml file in the data directory.
You should see a section like this:
<appender name="DB" class="com.inductiveautomation.logging.SQLiteAppender">
<dir>logs</dir>
<!--
Maintenance Settings
entryLimit: The maximum number of entries in the database. However, at any given time, there may be more than this number, due to how cleanup works.
maxEventsPerMaintenance: The number of event t…
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