hobbitgraph.cfg definition for graphing total # httpd servers

[Tom Georgoulias <tomg (at) mcclatchyinteractive.com>]

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

--- hobbitd/etcfiles/hobbitgraph.cfg.orig	2005-10-14 15:29:31.000000000 -0400
+++ hobbitd/etc/files/hobbitgraph.cfg	2005-10-14 15:33:36.000000000 -0400
@@ -710,10 +710,12 @@
 	#DEF:IS=apache.rrd:IS:AVERAGE
 	DEF:BW=apache.rrd:BW:AVERAGE
 	DEF:IW=apache.rrd:IW:AVERAGE
+	CDEF:TW=BW,TW,+
 	#LINE2:BS#00CC00:BS
 	#LINE2:IS#FF00FF:IS
 	LINE2:BW#555555:BW Busy Workers
 	LINE2:IW#880000:IW Idle Workers
+	LINE2:IW#FF0000:TW Total Workers
 	COMMENT:\n
 	GPRINT:BW:LAST:BW   \: %5.1lf%s (cur)
 	GPRINT:BW:MAX: \: %5.1lf%s (max)
@@ -723,6 +725,10 @@
 	GPRINT:IW:MAX: \: %5.1lf%s (max)
 	GPRINT:IW:MIN: \: %5.1lf%s (min)
 	GPRINT:IW:AVERAGE: \: %5.1lf%s (avg)\n
+	GPRINT:TW:LAST:TW   \: %5.1lf%s (cur)
+	GPRINT:TW:MAX: \: %5.1lf%s (max)
+	GPRINT:TW:MIN: \: %5.1lf%s (min)
+	GPRINT:TW:AVERAGE: \: %5.1lf%s (avg)\n
 
 [apache2]
 	TITLE Apache CPU Utilization