There is no built in log rotation on the script.
There is an archive option to compress logs: https://github.com/imperva/incapsula-logs-downloader
There could be a lot of reason why disk is full, try finding what is taking up the most space. du -h --max-depth=1 /
This will find the folders that take most space on the /, try going deeper with the folders that take the most space.
As for log rotate, you can use linux built in log rotate and configure it yourself.
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Sarvesh Lad
Tech Lead @ On-Prem Managed Services (WAF, DAM, DRA & Sonar)
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