[Bug 274194] sysutils/loki: New rc.d file for promtail

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274194

--- Comment #1 from Christopher Beppler <freebsd@funzi.org> ---
Hi Eren,

Thank you for taking initiative!

I like the idea of also providing a rc script for promtail. Since we shouldn't
deviate from upstream too much, I'd propose to use
https://github.com/grafana/loki/blob/v2.9.1/clients/cmd/promtail/promtail-local-config.yaml
as default configuration (adapted to FreeBSD paths where necessary, see below)

I'd see positions.yaml somewhere around /usr/local/var/db/loki. You're right,
it's a best a huge performance penalty if positions.yaml state file gets lost
on reboot.

If promtail is later configured by the user to run as root is up to the user.
Alternatively, the loki user could be put into the right groups to get read
access to the log files. That's not in scope of this port - we try to stay as
close as possible to upstream. If we can get the upstream
promtail-local-config.yaml running, we're good. The user will have to read
through the documentation to configure it properly anyways :-).

I plan to work on the version bump in the next days. If you attach a patch for
the current ports version (2.8.1), I am happy to submit it all together.

Thanks
Christopher

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