Hi, all,
I'm writing a ganglia python metrics module to monitor haproxy software's
performance. I'm following the steps at
http://ganglia.wiki.sourceforge.net/ganglia_gmond_python_modules. the modules
does send data back to gmetad but I still don't understand the following
parameters for metrics' descriptors, could you or someone shed a light into
this:
The following paragraph is excerpt from the html page:
-----------------------------------------------------------------
name: name of the metric
call_back: function to call when collecting metric data
time_max: maximum time in seconds between metric collection calls
value_type: string | uint | float | double
units: unit of your metric
slope: zero | positive | negative | both
format: format of your metric
description: description of your metric (which is visible in web frontend if
you hover over host metric graph)
group: group of your metric (metrics in the web frontend hostview is grouped by
this)
-----------------------------------------------------------------------
My questions are:
1, how can I specify RRD file's heartbeat rate here?
2, How can I specify a metric's type (COUNTER/GAUGE/DERIVE/etc)? And it value
range (min--max)?
3, when the metric has a large int (between 2**32 and 2**64) value, which
'value_type' should I specify? Is the 'uint' -- probably means unsigned int --
good enough?
3.1, If I specify 'uint' for 'value_type', and the metrics has a negative value
'-1' to specify the problematic situation where data is not retrievable, then
what will happen?
4, what do the 'slope' values mean? And how to specify it for a particular
metric?
Thanks a lot!
--Robinson
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