fix: alertmanager deprecated PIDFile= path warning

[atishaninov-xometry]

Starting from systemd 239 (commit link), it started showing warning about using deprecated path to pidfile in /var/run instead of /run.

This warning can be seen by launching command systemctl status alertmanager or sometring like journalctl -xeu alertmanager:

/etc/systemd/system/alertmanager.service:12: PIDFile= references a path below legacy directory /var/run/, updating /var/run/alertmanager.pid → /run/alertmanager.pid; please update the unit file accordingly.

[gardar]

Thanks!
Do you know if using /run/alertmanager.pid will cause issues on versions older than 239? Wondering if we could just use /run/ for all versions.

[atishaninov-xometry]

As far as i know, /run directory exists on systemd-based systems from 2011: https://lwn.net/Articles/436012/
Since introduction of /run, many distros implemented bind-mounting /var/run to /run or vice versa for compatibility.
I think it's safe to use /run for all supported distros.

[gardar]

As far as i know, /run directory exists on systemd-based systems from 2011: https://lwn.net/Articles/436012/ Since introduction of /run, many distros implemented bind-mounting /var/run to /run or vice versa for compatibility. I think it's safe to use /run for all supported distros.

Sounds good, do you mind changing it to /run/ for all versions then?
Thanks.

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