I see both "log" and "log.gz" in my file system, but I instead expect only "log.gz".

I've installed this on 2 different Jenkins instances and 2 different jobs. One job consistently has this problem; the other does not.

Perhaps this is interference with Log Parser Plugin? It might have file "log" open for reading while compress-buildlog wants to delete it, therefore the deletion fails. That's pure speculation on my part.

Here's a screenshot to prove my point:

NOTE: I marked this ticket as "Major" because it severely impacts the plugin's main purpose: saving disk space.