[isf-wifidog] gotta change cron/page.php

[Rob Janes]

the problem is that we're getting of emails from this cron monitor that 
throws messages every five minutes it seems until the downage is fixed.

i'd like to use cron/page.php, but i need to make some changes.

* to send emails to a list
* not to rely on the node tech officer (since we don't seem to be using 
that field)
* not to send repititious email
* send an email once when a threshold is crossed and then a reminder 
once a day.
* send an email when the node comes back up.

The thresholds I'd define would be
- down for 5 minutes
- down for 20 minutes
- down for 1 hour
- down for 2 hours
- down for 12 hours
then a message after midnight if the node has been down for more than 24 
hours.  I'd put the thresholds in config.php.

To support this i would need to add some fields to the nodes table, and 
some functions to nodes.php to support these fields.

last_paging_event: the threshold that was crossed when the last 
page/email was sent.  (this field is necessary)
downtime_start: start of current downtime - copy of last_heartbeat at 
that time.  (this field is necessary)
downtime_counter: count of downtimes since downtime_counter_start was 
set.  (this field is not necessary)
downtime_counter_start: timestamp of start of downtime_counter.  (this 
field is not necessary)

Looks like Max wrote cron/page.php.  Am I missing something, or does

>         } else if ($lastPaged - $last_heartbeat < 60*$minutes) {

not send an email practically everytime the cron runs, up to 120 minutes?

what do you guys think?  is this a friendly change, or not?  As usual, 
silence is golden.

fyi, i did try getting on the irc channel but nobody was listening.  
lights on, nobody home.

-rob