[rrd-users] VRULE Thickness and Legend Throttling

Lutzi lutz at bickhardt.fr
Tue Apr 13 13:39:12 CEST 2010


my application is readouts from current meters; my intent was to draw a
vertical line each full hour or each full day, obviously there may be many
vlines in one graph.

So I was looking in the web to learn how I could make use of time-variables
and found this post; that seemed to be the solution.

Here is an excerpt from my script:

COMMENT:"   graph made:  $(/bin/date "+%d.%m.%Y %H\:%M\:%S")" \
... (this works)
... and I get this: 
ERROR: parameter '%H' does not represent time in line VRULE:%H#FF0000:xxx

What is the problem here?

Further to the annotation of lines and points in this discussion, I would
like to do these things:

a) have the above "xxx" in the vertical line(s); (like --------- xxx
-------, if it was horizontal); the xxx represents meter values, so the
legend is not really the place and also I would have Gabriel´s problem of
many legend entries as well.

b) read "xxx" in from an hourly RRA, so I would need a variable too for

c) annotate events (which I also want to store in the RRA); events are
"text" such as "heater on" at a certain time, so I want to store this text
also in the RRA. However, events are random by nature, using the time
slotting of the RRA is not useful. So I would need a pseudo RRA with no
interpolation, averaging etc.

d) the overlay approach I do not like and of course I could store the events
in a separate DB, but we do want to improve RRDtool, don´t we?

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