[Xymon] Multi-graphs with subgraphs do not show properly

[W.J.M. Nelis]

Hello,

It seems that the combination of multi-graphs with sub-graphs may lead 
to unexpected results.

A local test, with name diskstat, checks some performance measures of 
disk I/O. (Basically it reads /proc/diskstats on a Linux machine, and 
dumps the measurements of selected partitions into an RRD, one RRD per 
partition.)  As there is one set of measurements for each partition to 
monitor, the graphs of diskstat are defined as multi-graphs:

In file cgioptions.cfg:
  CGI_SVC_OPTS=".... -multigraphs=diskstat,diskstat0,diskstat1,diskstat2"

As one RRD contains 11 datasets, a number of subgraphs is defined to 
show all the collected information. As shown above, there are 3 
additional graphs to show it all. The various bits of configuration with 
respect to test diskstat are:

xymonserver.cfg:
  TEST2RRD="....,diskstat"
  GRAPHS="....,diskstat::1,diskstat0::1,diskstat1::1,diskstat2::1"
tasks.cfg:
  CMD xymond_channel --channel=status .... --extra-tests=diskstat 
--extra-script=/home/nlr/xymon/server/ext/rrd_status.pl

Of course there are graph definitions for diskstat, diskstat0, diskstat1 
and diskstat2 in file graphs.cfg. Script rrd_status.pl also adds a line like
   <!-- linecount=N -->
to the status message, with N the number of partitions.

The layout of the page of test diskstat is correct. It shows the textual 
output of script rrd_status.pl and the graph diskstat multiple times, 
once per partition. The trends page is sometimes not as expected. If no 
TRENDS are defined for the host in file hosts.cfg, and thus no 
sub-graphs are selected, the trends column will show one diskstat graph 
per partition, which is what I would expect.

However, if the sub-graphs are selected for a host by adding
  TRENDS:*,diskstat:diskstat|diskstat0|diskstat1|diskstat2
to the entry of that host in hosts.cfg, the multiplicity of one, as 
defined in variable GRAPHS, does not function any more. For a host with 
two monitored partitions, the information of both partitions are shown 
in one graph.

Did I miss something in configuring the combination of multi-graphs with 
sub-graphs or is this an error in Xymon? Btw, we are using Xymon 4.3.7.


Kind regards,
  Wim Nelis.




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