This is a simple exporter for various statistics relating to a Postfix server.

Features

• Examines mail queue periodically and exports postfix_mail_queue_size;

• Reads syslog entries as they happen, and exports disposition status counters (postfix_disposition) per DSN, as well as delay summaries per DSN;

• Drinks from the syslog stream directly.

Deployment

The default way of rolling out this exporter is as a Docker container. For that, you'll want to setup a volume for the postfix queue (making it available in the container as /var/spool/postfix), and some env vars. You can also run it directly (via the gem), with the same env vars, and with the expectation that /var/spool/postfix is in the usual place.

Environment Variables

• SYSLOG_SOCKET -- where to read raw syslog events from. If you're running Postfix in an isolated container, you can probably hook up /dev/log directly between containers with a bit of shenanigans, otherwise configure your syslog daemon to write out a copy of all mail facility messages to a custom socket. Alternately, if you use logstash, take a look at the syslogstash gem and container, and go forth and sin no more.