[Xymon] Possible xymon bug - use of RRDPARAM in custom graphs

[W.J.M. Nelis]

Hello,

>
> I think I may have identified a possible bug in xymon. I am currently 
> running 4.3.12.
>
> I am attempting to define a custom graph using the RRDPARAM variable to 
> define the graph. The data that is "supplying" the graph is being 
> generated by a custom check and it stores this data over several rrd 
> files with a single value in each file.
>
> They key line in my graph definition is:
>
> DEF:p at RRDIDX@=@RRDFN@:@RRDPARAM@:AVERAGE
>
> What appears to be happening is that the different variables names that 
> represent the different parameters for the graph are different lengths. 
> It seems that what ends up being supplied to rdd on this line in the 
> graph definition contains extra white space added into the @RRDPARAM@ 
> part of the definition line and that these extra whitespaces correspond 
> to the largest variable name length. It seems to me that the internal 
> data structure is getting sized to the largest string length and then not 
> reduced for subsequent smaller strings and it just pads the rest with 
> whitespace. RRD then gets confused as it is looking for a variable named 
> "variable1  ", while the rrd file actually contains a variable called 
> "variable1".
>
> I would love to get the bug fixed as it is preventing some of my graphs 
> working. Happy to also be told there is a better way to do this. I hope 
> this makes sense. Happy to provide more info if required.
>
This is not a bug, it is a feature. When making multi-graphs, and when 
using @RRDPARAM@ in de GPRINT-statement, the columns will neatly line up.

The graph definition shows that you have a set RRD's, each containing a 
single DS with the same name as the file. Is it possible to give the DS a 
fixed name, for instance 'lambda'? If so, you can remove @RRDPARAM@ form 
the DEF-line.

Regards,
   Wim Nelis.





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