[collectd] [FR] notification severities += MISSING

[Michael Shigorin]

	Hello,
Just got a thousand and a half of paired email notifications like:

hostname/ipmi/temperature-Baseboard Temp system_board (7.1) has not been updated for 20 seconds.
[...]
Received a value for hostname/ipmi/temperature-Baseboard Temp system_board (7.1). It was missing for 20 seconds.

...and thought that it might make sense to differentiate between
known bad and unknown value -- maybe declaring missing ones as
MISSING and not FAILURE.

In the mean timt, putting in Timeout as suggested in
http://mailman.verplant.org/pipermail/collectd/2010-March/003689.html

PS: when one already has collectd, being able for it to speak
when really needed is magnificent :)  collectd+monit are cool :)

-- 
 ---- WBR, Michael Shigorin <mike at altlinux.ru>
  ------ Linux.Kiev http://www.linux.kiev.ua/