This is a stub. More documentation will follow.
A Telegraf daemon runs on all NixOS VMs. All metrics collected by Telegraf are picked up by Prometheus. You can add custom inputs by putting
*.conf files into
/etc/local/telegraf. Telegraf configuration files are in the TOML format. See the Telegraf configuration page for details. The available inputs are documented separately.
To activate the configuration, run sudo fc-manage --build. For further information, also see Local configuration.