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Custom Ganglia Cluster Charts - How to show the average value of an indicator, not the total value of an indicator

How do you show averages in user graphs, not general values?

I used to have the success of creating cluster summary graphs by creating custom .php files, as described here:

http://sourceforge.net/apps/trac/ganglia/wiki/Custom_graphs

However, up to this point, I wanted to show the general actions per second for this metric. But now I have some synchronization data, where I want to show the average (average) metric value for all nodes of the cluster. How it's done? With my current implementation, the generated graphs show the total time for all nodes, which does not help.

Here is the .php:

<?php

/* Pass in by reference! */
function graph_jmx_times_report ( &$rrdtool_graph ) { 

    global $context,
           $hostname,
           $graph_var,
           $range,
           $rrd_dir,
           $size,
           $strip_domainname;

    if ($strip_domainname) {
       $hostname = strip_domainname($hostname);
    }   

    $jmx = $graph_var;
    $title = $jmx.' Processing Time';
    if ($context != 'host') {
       $rrdtool_graph['title'] = $title;
    } else {
       $rrdtool_graph['title'] = "$hostname $title last $range";
    }   
    $rrdtool_graph['lower-limit']    = '0';
    $rrdtool_graph['vertical-label'] = 'milliseconds';
        $rrdtool_graph['extras']         = '--rigid --base 1024';
    $rrdtool_graph['height'] += ($size == 'medium') ? 89 : 0;

        $series = "DEF:'tot_time'='${rrd_dir}/jmx_tomcat_proc_time_ms.rrd':'sum':AVERAGE"
                ."DEF:'fc_time'='${rrd_dir}/jmx_tomcat_freqcap_lookup_time_75.rrd':'sum':AVERAGE "
                ."DEF:'ro_time'='${rrd_dir}/jmx_tomcat_readonly_lookup_time_75.rrd':'sum':AVERAGE "
                ."DEF:'rt_time'='${rrd_dir}/jmx_tomcat_realtime_lookup_time_75.rrd':'sum':AVERAGE "
                ."AREA:'tot_time'#CFF1FC:'' "
                ."LINE2:'fc_time'#F19A2A:'Freq Cap 75' "
                ."LINE2:'ro_time'#66CC33:'Read-only 75' "
                ."LINE2:'rt_time'#CC99CC:'Realtime 75' "
                ."LINE2:'tot_time'#20ABD9:'Processing Time' "
        ;

    $rrdtool_graph['series'] = $series;

    return $rrdtool_graph;

}

?>
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RRDs Ganglia num sum. num , sum, RRD.

REFT CDR , sum num.

:

if ($context != 'host') { // cluster or grid summary graph context
    $series = 
     "'DEF:fc_time_sum=${rrd_dir}/jmx_tomcat_freqcap_lookup_time_75.rrd:sum:AVERAGE' " 
    ."'DEF:fc_time_num=${rrd_dir}/jmx_tomcat_freqcap_lookup_time_75.rrd:num:AVERAGE' " 
    ."'CDEF:avg_fc_time=fc_time_sum,fc_time_num,/' " 
    ."'LINE2:avg_fc_time#0000FF:Average Freq Cap 75' ";
} else { // single host graph context
    //here you can't use the num data source
}

sample_report.php, ganglia-web.

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