[collectd] Lighttpd plugin

[Florent]

Hi,

I wrote a plugin to graph lighttpd statistics. Lighttpd already wrote a RRD file with its statistics in (requests/s, traffic in/out) and I wanted to use collectd to forward this RRD file to another server which hosts cacti to graph these values.

How it works:
- read function rrd_fetch a rrd file in the local filesystem and submit some values
- write function stores the transferred values in another RRD file

My plugin almost works, the only issue is the different step between the source RRD file (the lighttpd generated one: 60) and the destination RRD file (wrote by collectd on destination server: 10). That leads to different minimum or maximum values, but the average looks good. 

See attachment file if you want to take a look.

Florent
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