[PATCH] Distinguish between warning and critical notifications

[Mark Gius]

This patch is to address the issue I asked about in this thread:

http://article.gmane.org/gmane.network.nagios.user/65141

Currently, Nagios does not distinguish between warnings and criticals in 
service escalations.  This can cause problems with escalation chains as 
shown by this example.

    define serviceescalation {
       host         hostname
       service     servicename
       first_notification 3
       last_notification 0
       escalation_options c,u,r
    }

Currently, a service that is in WARNING for 3 notifications, then enters 
CRITICAL will match this service escalation.  The behavior I am looking 
for (and was expecting) is that after the 3rd critical or unknown, match 
this escalation.

The attached patch (patches cleanly to 3.0.6 and HEAD as of yesterday) 
adds the ability to specify service escalations that match after a 
specified number of critical or warning notifications.  IE:

    define serviceescalation {
       host         hostname
       service     servicename
       first_critical_notification 3
       last_critical_notification 0
       escalation_options c,u,r
    }

The patch adds 4 configuration directives to service escalations 
definitions:

    first_warning_notification #
    last_warning_notification #
    first_critical_notification #
    last_critical_notification #

Behavior is identical to (first|last)_notification, except that they 
check against the count of warning/critical notifications instead of the 
number of total notifications.

The behavior of the current directives is unchanged.  Existing 
deployments should not need to be modified with this patch applied.

I've run some tests for this patch off the 3.0.6 stable release, and it 
seems to be working fine.  Ran overnight without any complaints from the 
logs, and the behavior is as I expect it to be.

Suggestions for improvements welcome.

-Gius
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