It comes down to the source of the failure you want to monitor. Using systemd will let you restart weewx if it stops running but will not detect it looping or otherwise 'working' (as seen by the OS). It also won't detect a OS crash or power down. if you just want the appearance of a file or data records etc. on some external computer (whether inside or outside your LAN) then you could set up something like an MQTT broker and have an app that subscribes tot he packets and does whatever you want if something is not received - a bit like a 'heartbeat monitor' app. However this would show you an error if anything between weewx and the subscriber was not working, not weewx specifically. Susan
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