[mrtg] Advice: monitoring GPS based clock

McDonald, Dan Dan.McDonald at austinenergy.com
Fri Sep 2 18:51:34 CEST 2011

We have some ntp clocks that provide snmp monitoring.  Unfortunately, the
data presented is not structured nicely in a mib:

[...time passes]


The format of the string is:
N, x1,y1,z1,x2,y2,z2...xn,yn,zn
Where N is the number of currently visible satellites , the x,y,z are
specific information about each satellite.  X is a unique number associated
with the satellite, Y is the dB loss talking to it, and Z is a flag
indicating whether the time protocol considers the satellite or is just
tracking it for later.

N seems pretty easy to graph.  I can use either a ConversionCode parser or a
simple perl script to gather the requisite info.
Building a separate target for each possible value of X (with a value of Y)
seems possible.  I¹d then use a routers2.cgi stacked graph to display them.
The negative value is only slightly challenging ­ just an rrdtune and I
should be able to provide the information.  I¹m not certain what the max is
­ I cold probably get away with 1.  The minimum is ­200.

However, I don¹t know what the possible X values are, so pre-loading that
seems challenging.  I think adding targets on the fly in mrtg (by adding
them to the $$targ array) would be a tad challenging.

I¹d appreciate some suggestions.
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