[Xymon] DS checks that check multiple values in analysis.cfg

[SebA]

Hi, has anyone done DS checks in analysis.cfg that test multiple values
from the same rrd file?  We have data in ncv format that gets written to an
rrd file and I want to be able to check expressions against multiple values
at the same time, e.g. in logic, where A, B, C and D are all graphed in the
same rrd file :

If A + B / C > 33% go red
But if C < 10 go green anyway (override the above calculation, as it would
not be statistically reliable)
And if D > 30 go green anyway

The man page doesn't state how rules should be written:
http://xymon.sourceforge.net/xymon/help/manpages/man5/analysis.cfg.5.html#lbAN

I've tried to read the code:
https://sourceforge.net/p/xymon/code/HEAD/tree/branches/4.3.29/xymond/client_config.c
But I'm not a C programmer so that didn't help me.

Can anyone help?

Kind regards,

SebA
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