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Run things as background processes #3556
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This fixes #3518, and ensures that we get useful logs and metrics for lots of things that happen in the background. (There are certainly more things that happen in the background; these are just the common ones I've found running a single-process synapse locally).
This is more involved than it might otherwise be, because the current implementation just drops its logcontexts and runs everything in the sentinel context. It turns out that we aren't actually using a bunch of the functionality here (notably suppress_failures and the fact that Distributor.fire returns a deferred), so the easiest way to fix this is actually by simplifying a bunch of code.
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erikjohnston
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This fixes #3518, and ensures that we get useful logs and metrics for lots of things that happen in the background.
(There are certainly more things that happen in the background; these are just the common ones I've found running a single-process synapse locally).