hobbitgraph.cfg definition for graphing total # httpd servers

[Tom Georgoulias]

A problem came up which required us to monitor the total number of 
apache servers running on our webservers, and I solved it by adding 
adding a CDEF to apache1 hobbitgraph.cfg definition.  The attached patch 
uses sum of the idle & busy workers data values to create a third value, 
total workers, for hobbit to graph.  It also allowed me to use data I 
was already collecting with my apache tests instead of creating a new 
test or addon script, which is always good in my mind.

Since it did the trick and we were able to monitor httpd more closely, I 
thought I'd throw the patch out to the list for others to use, if they 
needed something like this.  If so, I hope it helps you.

Tom

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