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# Prometheus Postfix exporter
This repository provides code for a Prometheus metrics exporter
for [the Postfix mail server](http://www.postfix.org/). This exporter
provides histogram metrics for the size and age of messages stored in
Prometheus metrics exporter for [the Postfix mail server](http://www.postfix.org/).
This exporter provides histogram metrics for the size and age of messages stored in
the mail queue. It extracts these metrics from Postfix by connecting to
a UNIX socket under `/var/spool`.
a UNIX socket under `/var/spool`. It also counts events by parsing Postfix's
log entries, using regular expression matching. The log entries are retrieved from
the systemd journal or from a log file.
In addition to that, it counts events by parsing Postfix's log entries,
using regular expression matching.
The log entries are retrieved from the systemd journal or from a log file.
## Options
Please refer to this utility's `main()` function for a list of supported
command line flags.
These options can be used when starting the `postfix_exporter`
| Flag | Description | Default |
|--------------------------|------------------------------------------------------|-----------------------------------|
| `--web.listen-address` | Address to listen on for web interface and telemetry | `9154` |
| `--web.telemetry-path` | Path under which to expose metrics | `/metrics` |
| `--postfix.showq_path` | Path at which Postfix places its showq socket | `/var/spool/postfix/public/showq` |
| `--postfix.logfile_path` | Path where Postfix writes log entries | `/var/log/maillog` |
| `--log.unsupported` | Log all unsupported lines | `false` |
| `--systemd.enable` | Read from the systemd journal instead of log | `false` |
| `--systemd.unit` | Name of the Postfix systemd unit | `postfix.service` |
| `--systemd.slice` | Name of the Postfix systemd slice. | `""` |
| `--systemd.journal_path` | Path to the systemd journal | `""` |
## Events from log file