Hi, I've 2 different data sources from 2 separate RRD files. Both heartbeats are the same, and the 'step' for both RRD files are the same. Is it possible to write a CDEF to compute the average of some of the samples from these 2 data sources and then graph this average value ? By 'some samples', I mean samples from a certain period of time in the past. By looking at the manpages of 'rrdtool graph', I can't see how this can be done via CDEF... or am I misusing CDEF or missing the point of CDEF ?
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