timer "OnBootSec=15m" not triggering

["Ulrich Windl" <Ulrich.Windl@xxxxxxxxxxxxxxxxxxxx>]

Hi!

I wrote some services that should run when booting and some time after
booting.
As it seems the service to run during boot works, but the timer-triggered one
does not.
I have no idea why.

Here are the details:
# systemctl status prevent-fencing-loop.service
● prevent-fencing-loop.service - Prevent Pacemaker Fencing-Loop
     Loaded: loaded (/usr/lib/systemd/system/prevent-fencing-loop.service;
enabled; vendor preset: disabled)
     Active: inactive (dead) since Sat 2022-03-05 10:33:50 CET; 1 day 23h ago
       Docs: man:boot-loop-handler(8)
   Main PID: 5226 (code=exited, status=0/SUCCESS)

Mar 05 10:33:50 h19 systemd[1]: Starting Prevent Pacemaker Fencing-Loop...
Mar 05 10:33:50 h19 boot-loop-handler[5234]: 1 of 4 allowable boots
Mar 05 10:33:50 h19 systemd[1]: prevent-fencing-loop.service: Succeeded.
Mar 05 10:33:50 h19 systemd[1]: Finished Prevent Pacemaker Fencing-Loop.

So this service ran during boot.

# systemctl status reset-boot-counter.timer
● reset-boot-counter.timer - Reset Boot-Counter after 15 minutes
     Loaded: loaded (/usr/lib/systemd/system/reset-boot-counter.timer;
enabled; vendor preset: disabled)
     Active: inactive (dead)
    Trigger: n/a
   Triggers: ● reset-boot-counter.service
       Docs: man:boot-loop-handler(8)

So my guess is the timer never triggered, and the service was never started:
# systemctl status reset-boot-counter.service
● reset-boot-counter.service - Reset Boot-Counter for detecting Fencing-Loop
     Loaded: loaded (/usr/lib/systemd/system/reset-boot-counter.service;
static)
     Active: inactive (dead)
       Docs: man:boot-loop-handler(8)

The timer is:
# systemctl cat reset-boot-counter.timer
# /usr/lib/systemd/system/reset-boot-counter.timer
[Unit]
Description=Reset Boot-Counter after 15 minutes
Documentation=man:boot-loop-handler(8)


[Timer]
OnBootSec=15m
AccuracySec=1s

[Install]
WantedBy=timer.target
----------------
"systemd-analyze verify" finds no problems.

systemd being used is that of SLES15 SP3 (probably also openSUSE LEap 15.3)
(systemd-246.16-150300.7.39.1.x86_64)

Regards,
Ulrich