Re: automatic derived metrics slowing down remote pcp clients, esp. pmlogconf

["Frank Ch. Eigler" <fche@xxxxxxxxxx>]

Hi -

> patch looks good - HOWEVER, 

To some extent, that's a separate matter; none of our pmlogconf
fragments invite the derived metrics for logging.

> thinking about this a bit more, ideally if a pmlogger config (or
> pmlogconf config) asks for a derived metric to be logged, it should
> expand this and log the leaf operand metrics. [...]

IMHO logging a derived metric - if specifically requested by a
pmlogger.conf file, should be exactly what pmlogger stores.  There is
no guarantee that any other client at any other place/time would have
the same definition for the derived metric.  Thus there's no reason to
assume that the values could be recomputed identically, even if the
individual inputs were stored.

- FChE