Custom consolidation function

[phisto]

It is necessary to be able to add a line graph with values from previous week, month, and so on.

Like this from rrd tutorial:

Viewing the current and previous week together
DEF:thisweek=router.rrd:ds0:AVERAGE
DEF:lastweek=router.rrd:ds0:AVERAGE:end=now-1w:start=end-1w

[gandalf]

This is not possible right now. Cacti 088 (not yet published) will support SHIFT, which may help as well.
R.