Probably wrong place. Sorry. Is there a plugin or built-in feature so that in chat it is broadcasted when the world saves and what world (Last bit not that important). I am using spark to find large spikes and I am unsure whether or not or the spikes are from world-saving or not, I would like to be certain. Spigot version is 1.12.2 if that helps.
If your using a host, they normally have options for 'announcing world save' Just my note to add in-case.
I tried making a plugin that would broadcast on world save but it only works with the /save-all command and not with the built-in autosave feature, is there a different event for that?
Maybe share your spark results. Those should be enough to determine where lag spikes are coming from.