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we saw exceptions on prod that I think might have caused a worker that is being terminated to die ungracefully. While I'm not sure if this is an actual problem that changed behaviour (app instances crashing and restarting), at the very least it definitely polluted the logs and obscured any actual issues we were having.
https://github.com/prometheus/client_python/releases/tag/v0.10.0
see the pending fix for this problem here: prometheus/client_python#644