[collectd] rrdtool plugin: no LAST?

[Mark]

Bruno,
I'm fairly certain it's one of the four native aggregate functions used
when creating an RRA. From the 'rrdcreate' man page:

 "The data is also processed with the consolidation function (CF) of the
archive. There are several consolidation functions that consolidate primary
data points via an aggregate function: AVERAGE, MIN, MAX, LAST."

The way I understand it, LAST is basically the last data point with no
manipulation. It's not necessarily useful for graphing because it's rather
spiky, but it's a good value for labels.

Mark


On Fri, Jul 27, 2012 at 3:18 PM, Bruno Prémont <bonbons at linux-vserver.org>wrote:

> Hi Marc,
>
> On Fri, 27 July 2012 Mark <gajillion at gmail.com> wrote:
> > Hi all,
> > We're trying to use collectd to front-end Cacti and I've just discovered
> > that the RRDTool Plugin does MAX, MIN, AVERAGE, but doesn't store LAST.
> > Most of our Cacti graphs use LAST to display the current value. Am I
> > missing something obvious or is LAST just not supported?
>
> Isn't LAST just a special access to RRD's RRAs, as in always present?
>
> > Mark
>
> Bruno
>
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