feat(settings): Add setup check for apcu cache expunge

[juliusknorr]

• Resolves: Setup check for apcu cache statistics #46282

Summary

This adds a basic setup check to warn admins if their APCu cache is close to be full or has been expunged. Ideally we would be able to calculate something like a rate for how long the cache is kept until cleaned up, but i couldn't find a reasonable metric and we cannot get the startup time of the php service itself.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[skjnldsv]

Nice!

[come-nc]

Does that apply to cli as well? Remember that setupchecks can be run by occ and in this case they use the php cli ini file which is not configured the same as web.

[juliusknorr]

Right, we cannot really check in cli as there is no shared memory with what ever SAPI is used.

[come-nc]

Right, we cannot really check in cli as there is no shared memory with what ever SAPI is used.

Then the check should check the CLI flag and bail out, take inspiration from other php config related checks.