One of my clients complaining that he is getting 508 Service Temporary Unavailable error on his site

The customer is most likely restricted due to high usage. You can diagnose the problem by running:

If user is limited on max entry processes, you will see how many times his site was limited (served 508) within past day (–period=1d).

You can also monitor current usage via:

Solution: In most cases you don’t want to do anything, as this customer might overload the system by exhausting all apache connections or some other resources of the system. Yet, in some cases you might want to increase limit by doing:

Default limit is 20 concurrent connections (max entry processes)

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