f7fe1840f1
When a rate limit is armed, for example via StartLimitInterval=, and the machine is suspended, the rate limit's "clock" is suspended as well, since the elapse checks use CLOCK_MONOTONIC. This then causes unexpected situations where a rate limit armed via StartLimitInterval=1h, followed by a 10 hour suspend, would elapse after 11 hours total. Let's avoid this by switching the rate limits to CLOCK_BOOTTIME, which works the same as CLOCK_MONOTONIC, but accounts for the time spent in suspend as well. There's one slight concern when it comes to upgrade path - the old "begin" value of the rate limit is stored as CLOCK_MONOTONIC, but after upgrading systemd and serializing/deserializing the state it will be suddenly compared against now(CLOCK_BOOTTIME), which might cause some rate limits to elapse "prematurely". But this is just a one-time thing, after which the rate limit timers should re-assess themselves. Resolves: #42912 (cherry picked from commit9ae50c78cc) (cherry picked from commit4cff7ce255) (cherry picked from commit6089849fa3)
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