Monitoring script

[abh]

It'd be handy to have a script that monitors a set of servers.

The script could get the nameservers by aggregating all that are used in the pgeodns
configuration (the NTP Pool code has some code for this already).

The monitoring configuration file should have a contact email address (or a list of addresses?)
for each nameserver.

The output should have the names used for each nameserver, the reverse dns for the nameserver
and the contact email address.

Desired checks:

• check that a particular zone exist (and that the serials matches?)
• check pgeodns version (to notify admins to upgrade)
• record query count for graphs etc