On Fri, 2022-09-02 at 09:45 +0100, Barry Scott wrote:
> 
> 
> > On 1 Sep 2022, at 22:42, Patrick O'Callaghan
> > <pocallag...@gmail.com> wrote:
> > 
> > The first hit is from 20 years ago and basically says "don't worry
> > about it" while referring to a man page I don't understand.
> 
> Maybe post your subscriptions.conf and see if someone does know what
> it means?
> 
> That first post seems to imply that there is config asking for
> notifications every seconds.
> 
> But this is not something I have every setup myself.

# Subscription configuration file for CUPS v2.4.2
# Written by cupsd
NextSubscriptionId 1522
<Subscription 1520>
Events printer-state-changed printer-restarted printer-shutdown
printer-stopped printer-added printer-deleted printer-modified job-
state-changed job-created job-completed job-stopped job-config-changed
job-progress server-restarted server-started server-stopped server-
audit
Owner poc
Recipient dbus://
LeaseDuration 3600
Interval 0
ExpirationTime 1662114916
NextEventId 31
</Subscription>
<Subscription 1521>
Events printer-state-changed printer-restarted printer-shutdown
printer-stopped printer-added printer-deleted printer-modified job-
state-changed job-created job-completed job-stopped job-config-changed
job-progress server-restarted server-started server-stopped server-
audit
Owner poc
Recipient dbus://
LeaseDuration 3600
Interval 0
ExpirationTime 1662116459
NextEventId 1
</Subscription>

A couple of things stand out:

1) There are two subscriptions, but I have only one printer. Looks like
a config error on my part which I'll look at.

2) The Interval entry is 0 in both cases, though I've no idea why. That
probably explains the 1-second frequency of journal entries.

The man page says that this file is maintained by cupsd and should not
be user-edited. The cupsd(8) page is just an anchor for a whole bunch
of other pages which I will have to investigate.

poc
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