Arian van Putten d28af58cbb agent: implement sd-notify reload correctly (#25636) ...

First of all, we should not send the unix time, but the monotonic time.
Second of all, RELOADING= and MONOTONIC_USEC fields should be sent in
*single* message not two separate messages.

From the man page of [systemd.service](https://www.freedesktop.org/software/systemd/man/latest/systemd.service.html#Type=)

> notification message via sd_notify(3) that contains the "RELOADING=1" field in
> combination with "MONOTONIC_USEC=" set to the current monotonic time (i.e.
> CLOCK_MONOTONIC in clock_gettime(2)) in μs, formatted as decimal string.

[sd_notify](https://www.freedesktop.org/software/systemd/man/latest/sd_notify.html)
now has code samples of the protocol to clarify.

Without these changes, if you'd set
Type=notify-reload on the agen'ts systemd unit, systemd
would kill the service due to the service not responding to reload
correctly.

2025-04-14 11:38:56 -04:00

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