[Devmon] Create graph of devmon runtime in Xymon

[W.J.M. N. <ne...@nl...>]

Hello,

by default, Devmon statistics in Xymon will show the last runtime, as 
well as the average run-time of the last 5 runs. I wanted to have a 
graph showing the run-time of Devmon. I've made the following 
modifications in module dm_msg.pm:

[xymon]$ diff -u dm_msg.pm.org dm_msg.pm
--- dm_msg.pm.org       2009-01-22 17:42:12.000000000 +0100
+++ dm_msg.pm   2010-03-19 09:17:44.000000000 +0100
@@ -22,6 +22,7 @@
   use strict;
   use Socket;
   use dm_config;
+  use POSIX qw/ strftime / ;
 
  # Our global variable hash
   use vars qw(%g);
@@ -186,13 +187,21 @@
       $avg_time /= $num_polls;
       $message .= "$avg_time seconds\n\n" .
         "Poll time averaged over 5 poll cycles.";
-
     }
 
+   # Replace ":" and "=" in order not to confuse the Xymon NCV module
+   # Write the polling time (in HTML comment) for storage in an RRD
+    $message =~ s/:/:/g ;
+#   $message =~ s/=/=/g ;
+    $message .= "<!--\n"                       .
+               "PollTime : $this_poll_time\n"  .
+               "-->" ;
+
    # Add the header
     my $host = $g{'nodename'};
     $host =~ s/\./,/g; # Dont forget our FQDN stuff
-    $message = "status $host.dm green ".(scalar 
localtime)."\n\n$message\n";
+    my $now = $g{'bbdateformat'} ? 
strftime($g{'bbdateformat'},localtime) : scalar(localtime);
+    $message = "status $host.dm green $now\n\n$message\n";
 
     return $message;

Note that these modifications contain a second, independent enhancement 
as well: the timestamp of test dm has been changed to use the format 
specified in BBDATEFORMAT, if available.

In order to get a graph, two configuration files of Xymon need some 
exension. In file hobbitserver.cfg, variable TEST2RRD is extended with 
"dm=ncv", and a new variable NCV_dm is defined:
  NCV_dm="*:GAUGE"

File hobbitgraph.cfg needs to be extended with a graph definition, 
something like:

[dm]
        TITLE , Devmon runtime
        YAXIS Runtime [s]
        DEF:time=dm.rrd:PollTime:AVERAGE
        LINE1:time#FF0000:Runtime
        GPRINT:time:MIN:Min\: %5.1lf %ss
        GPRINT:time:MAX:Max\: %5.1lf %ss
        GPRINT:time:AVERAGE:Avg\: %5.1lf %ss
        GPRINT:time:LAST:Cur\: %5.1lf %ss\n


Regards,
  Wim Nelis.



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