Preventing outages with pkill's new --require-handler flag

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tl;dr: Do not use signals in production wherever possible. Use safer alternatives like sockets or varlink instead. See my earlier article for some reasons why. However, if you have to use signals, it is important to know that one cause of production outages is missing the removal of signal senders when removing signal handlers (like SIGHUP). This can cause services to terminate unexpectedly…

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