bug#62163: Suppress logging shepherd evaluation in mcron.log

[Bruno Victal]

On 2023-03-30 11:22, Ludovic Courtès wrote:
> Hi,
> 
> Bruno Victal <mirai@makinata.eu> skribis:
> 
>> On 2023-03-28 17:25, Ludovic Courtès wrote:
>>>
>>> Nope. :-)  What is ‘my-heartbeat-job’ doing?
>>
>> It queries shepherd to see if a service is running and sends a restart if 
>> required.
> 
> Isn’t that what #:respawn? #t is supposed to do?  :-)
> 
> If you find that #:respawn? doesn’t work, then we should fix it.

Oh, I should have explained better here.
Re-spawn works, it's the (daemon) service that might misbehave/go unresponsive 
without crashing,
i.e. HTTP backend stops responding to API requests but the server is still up.
The job performs a "health-check" and restarts it if it doesn't get the 
appropriate response.

A concrete situation where this could be of use is for logs.guix that 
occasionally stops
recording.


> 
> You can send messages to the bitbucket with:
> 
>   (parameterize ((shepherd-message-port (%make-void-port "w0")))
>     …)

Thanks!
I'm still curious as to exactly what/which lines cause shepherd to output the 
lines.


Cheers,
Bruno