[rrd-users] Re: HRULES and averages

[Alex van den Bogaerdt]

Antonio Navarro Navarro wrote:

> I'm graphing several metrics of server traffic using RRD, and want to
> draw a HRULE at the average of the values.  Can I get the average value
> of the time series drawn without having to dump all the data and
> compute it myself?

You can use "rrdtool graph" not only to actually create an image, you
can also use it to calculate a text report.  Read the rrdgraph manual
and look specifically for "PRINT" (-->not<-- GPRINT).  Use the resulting
value in a second call to rrdtool, inside the HRULE statement.

HTH
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