Greetings all...
I've been working on graphs for printer monitoring, and had run into the
bug/feature where you cannot have a single snmp OID as both a Gauge and a
Counter (in this case, the OID to get Total Pages Printed).
After a little searching on the RRDTool website, I found the work-around: the
PREV command will allow me to make a derivative of the Gauge to get (more or
less) the Counter.
For just one device, it works great. Make a new graph, add the Gauge data
source. In the details of this Graph Point, set the line type to "Not Drawn".
Now it's not in the graph but available for RPN calculations. Now, under the
Custom Graph Definition, I put
CDEF:prev1=PREV(TotalPages-raw)
CDEF:delta=TotalPages-raw,prev1,-
LINE:delta#00cc00:${here/name | here/id} Pages
GPRINT:delta:LAST:cur\:%5.2lf%s
GPRINT:delta:AVERAGE:avg\:%5.2lf%s
GPRINT:delta:MAX:max\:%5.2lf%s\j
...and click on Save. "prev1" and "delta" show up as Available RRD Variables,
and I get a green line showing roughly how many pages were printed in the last
5 minutes. (The RRDTool site included the timestamps in the calculation to get
a per-second result, if you prefer.)
OK: now for the hard part. When I plug that into the Custom Graph Definition
for a MultiGraph report, and ask for a bunch of devices to collected into one
graph, I get no output - presumably because Zenoss does not want to graph 5
devices with the exact same green line. I know there's a "colors" array out
there. I've tried things along the lines of substituting
"${colors[collection/index]}" for "#00cc00" but have not hit upon the magic
words yet.
Thus the question of the day... How should one specify the line color for an
RPN'd Graph Point in a MultiGraph report?
Thanks to any who actually read this far...
--Jay
-------------------- m2f --------------------
Read this topic online here:
http://community.zenoss.com/forums/viewtopic.php?p=16358#16358
-------------------- m2f --------------------
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