rsyslog prometheus exporter

This software acts like a syslog server and prometheus exporter at the same time. It listens on a network socket for impstats syslog messages and exposes them as a prometheus metrics.

NOTE: This exporter is different from soundcloud kind of exporters. Metrics are exposed in different format (closer to the impstats).

How to setup

1. Download the rsyslog_exporter binary (TBD) and put it to the /usr/local/bin/rsyslog_exporter path e.g.

2. Run rsyslog_exporter. By default it'll listen for RFC3164 syslog messages on UDP port 5145 on all interfaces. Prometheus metrics will be exposed on port 9292.

3. Configure impstats to send counters data as syslog messages to the rsyslog_exporter syslog listener:

module(load="impstats"
  interval="60"
  resetCounters="off"
  format="json"
  ruleset="stats"
)

ruleset(name="stats") {
  action(type="omfwd" name="stats_fwd"
    target="127.0.0.1"
    port="5145"
    protocol="udp"
  )
}

3. Check rsyslog configuration systax by running rsyslogd -N 1

4. Restart rsyslog if no errors found (systemctl restart rsyslog e.g.)

5. Go to http://localhost:9292/metrics to see metrics

Command-line parameters

  -listen-address string
      IP:port at which to serve metrics (default ":9292")
  -metrics-endpoint string
      URL path at which to serve metrics (default "/metrics")
  -syslog-format string
      Which syslog version to use (rfc3164, rfc5424) (default "rfc3164")
  -syslog-listen-address string
      Where to serve syslog input (default "udp://0.0.0.0:5145")

TODO

• add custom global labels
• support collecting metrics from multiple rsyslog instances
• better tests
• better errors