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This PR adds a bit of information about Opcode cache. We've been dealing at our company with performance issues regarding opcache and it's configuration on some customer's sites, and wanted to contribute back our learnings by allowing people (and hosts most importantly) to be able to identify problems related to this.
APC is legacy, for which we had to scout for information and get basic cache hit. Not sure how much is it actively used, but nothing should break there.
For OPCache, I've added a bunch of information to the overview tab. Mainly the cache hits for the current request (opcache provides statistics for the whole lifecycle of the FPM process), and also several memory/limits indicators.
Tried to keep UX similar to the rest of QM, hopefully not disturbing anything.
There is a change in function names (due to untying object cache stats from opcode cache stats). I opted for the small refactor in order to keep things clean.