Mike Yuan
406aeb5da6
We have RestartMaxDelaySec= + RestartSteps= to exponentially increase auto restart durations, but it currently cannot be reset by the service itself, which makes it sometimes awkward to use. A typical pattern in real life is that a service was once down (e.g. due to temporary network interruption) and multiple restarts were attempted. Then, future restarts would always wait for increated amount of time based on RestartMaxDelaySec=, even after the original problem got resolved. Such "persistence" could result in longer unavailablity than there should be for failures that come later. (C.f. https://utcc.utoronto.ca/~cks/space/blog/linux/SystemdResettingUnitBackoff) Let's introduce a new sd_notify() notification for resetting the restart counter. There were discussions about making this timer-based, but I think it's more flexible to leave the decision-making to the service. This enables them to do a combination of N successful requests + uptime check for instance.
System and Service Manager
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