It depends on whether you care about the status of postfix itself. For systems which are just running postfix as a replacement for /usr/bin/sendmail, then it's only being used for outbound deliveries - e.g. cron and error reports. In this instance, I suppose it could be interesting to measure the size of the queue, and count rejected mail - as you say, a textfile exporter would be straightforward. Alternatively, using the systemd collector of node_exporter may be good enough to check that the postfix service is running.
Personally I don't run MTAs on servers in general: I install ssmtp and point it to a local mail relay. Then there's nothing to monitor, apart from the central mail relay itself. This also scales better with containers - if you have 20 containers on one machine you don't want 20 MTAs running. -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/c7eb018d-c9a8-4ad3-9230-80e43f0360b1o%40googlegroups.com.
