Is it necessarily a memory leak though?
yes, unintended memory growth is always a leak
It seems possible it's just a side effect of having a very long-running Perl process that's never going to release memory back to the system.
While that is possible (operating system memory managers are tricky) it is very unlikely. With proper scoping the memory should be stable, it might peak during requests, but it should stabilize.
If it doesn't, and you didn't code a giant %CACHE hash, then it is definitely a leak (unintended memory growth). See Re^3: Scope of lexical variables in the main script for some links/discussion
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