[collectd] collectd plugin for monitoring internal values

[Yves Mettier]

Hello,

How can we monitor internal values of collectd ?

- the number of values in the cache (my jsonrpc plugin does it already, 
but it would be better if there was a dedicated way to do it)

- the number of values enqueued in the new write queue (see 
write_queue_size in #280)

- any other metric that show the health of collectd like the number of 
read values and of written values...

What about a "collectd" read plugin ? And public functions in 
collectd.c/h and plugin.c/h to retreive the values.

Can I start to code such a plugin ?

Regards,
Yves


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