[PATCH] notifications: Fix first_notification_delay

[Jochen Bern]

On 11.12.2012 22:56, Jim Avery wrote:
> We want to send an SMS notification if the UPS goes on to battery, but only
> if it has been on battery for more than, say, five minutes.  I had hoped
> that first_notification_delay would give me that possibility.  Obviously as
> this is a passive check [...]
> 
> Please forgive me that I don't understand the programmatical issues well
> enough to see if any of the proposed solutions so far will fit this use
> case.

I'ld say that our discussion is perpendicular to the issue you raise -
or, in other words, that first_notification_delay is unlikely to
suddenly work the way you want afterwards.

You see, while everyone just calls it "passive checks", the terminology
in the web UI - "active checks disabled" - is more correct. (Yes, a
service *could* have active *and* passive check results going into it.
I've just never seen a working setup doing that, or a use case seriously
asking for it.) Using "passive checks" means that Nagios can forget
about scheduling commands for that service, ever; waiting for events and
reacting to them is all that's required.

Asking that Nagios now *should* schedule a notification being sent
first_notification_delay after receiving a non-OK passive result sort of
negates the entire concept.

What I'ld try in your place is to write the (last) trap into a cache
file, and then run an *active* check looking for the reported state *and
timestamp*, possibly differentiating WARNING/CRITICAL based on the latter.

(Note to others: Actively checking the UPS' *current* state directly
could yield false positives *if* the UPS / power keeps flapping and the
active checks just *happen* to see only the on-battery state for a
couple times in a row.)

Regards,
								J. Bern
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