Munin contributed plugins

#!/usr/bin/perl

#

## Copyright (C) 2012 Andrey Pankov <a.pankov@gmail.com>

##

## This program is free software; you can redistribute it and/or

## modify it under the terms of the GNU General Public License

## as published by the Free Software Foundation; version 2 dated June,

## 1991.

##

## This program is distributed in the hope that it will be useful,

## but WITHOUT ANY WARRANTY; without even the implied warranty of

## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

## GNU General Public License for more details.

##

## You should have received a copy of the GNU General Public License

## along with this program; if not, write to the Free Software

## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

##

##

## $Log$

##

## Based on resque monitoring code from https://github.com/caius/redis-munin

##

## Installation process:

##

## 1. Download the plugin to your plugins directory (e.g. /usr/share/munin/plugins)

## 2. Create 5 symlinks at the directory that is used by munin for plugins detection (e.g. /etc/munin/plugins): resque_failed, resque_queues, resque_queues_size, resque_workers_count, resque_workers_working

## 3. Edit plugin-conf.d/munin-node if it is needed (env.namespace, env.host and env.port variables are accepted)

## 4. Restart munin-node service

use strict;

use Redis;

my $HOST = exists $ENV{'host'} ? $ENV{'host'} : "127.0.0.1";

my $PORT = exists $ENV{'port'} ? $ENV{'port'} : 6379;

my $NAMESPACE = exists $ENV{'namespace'} ? "resque:${ENV{'namespace'}}" : 'resque';

my $server = "$HOST:$PORT";

my $r = Redis->new( server => sprintf("%s:%d", $HOST, $PORT) );

my $config = ( defined $ARGV[0] and $ARGV[0] eq "config" );

$0 =~ s/(.+)resque_//g;

my $opt = $0 ? $0 : 'default';

if ($opt eq 'failed') {

    if ($config) {

        print "graph_title Resque Failure rate\n";

        print "graph_category system\n";

        print "graph_info This graph shows resque jobs that failed\n";

        print "graph_args --lower-limit 0\n";

        print 'graph_vlabel fails/s\n';

        print "failed.label Failed per/s\n";

        print "failed.type COUNTER\n";

    }

    else {

        my $value = $r->get("${NAMESPACE}:stat:failed") || 0;

        print "failed.value $value\n";

    }

}

elsif ($opt eq 'queues') {

    if ($config) {

        print "graph_title Resque queue rates\n";

        print "graph_category system\n";

        print "graph_vlabel queue rates/s\n";

        print "graph_info This graph monitors the in and out rate of the queues\n";

        print "graph_args --lower-limit 0\n";

        my @queues = $r->smembers( "${NAMESPACE}:queues" );

        for my $name (@queues) {

            $name =~ s/:/_/;

            print "${name}_pushed.label ${name}_pushed\n";

            print "${name}_pushed.type COUNTER\n";

            print "${name}_finished.label ${name}_finished\n";

            print "${name}_finished.type COUNTER\n";

        }

    }

    else {

        my @queues = $r->smembers( "${NAMESPACE}:queues" );

        for my $queue (@queues) {

            my $name = $queue;

            $name =~ s/:/_/;

            my $pushed = $r->get("${NAMESPACE}:stat:${queue}:pushed") || 0;

            print "${name}_pushed.value ${pushed}\n";

            my $finished = $r->get("${NAMESPACE}:stat:${queue}:finished") || 0;

            print "${name}_finished.value ${finished}\n";

        }

    }

}

elsif ($opt eq 'queues_size') {

    if ($config) {

        print "graph_title Resque queue current size\n";

        print "graph_category system\n";

        print "graph_vlabel queue size\n";

        print "graph_info This graph monitors the current queues size\n";

        print "graph_args --lower-limit 0\n";

        my @queues = $r->smembers( "${NAMESPACE}:queues" );

        for my $name (@queues) {

            $name =~ s/:/_/;

            print "${name}_size.label ${name}_size\n";

            print "${name}_size.type GAUGE\n";

        }

	print "total.label total\n";

	print "total.type GAUGE\n";

    }

    else {

        my @queues = $r->smembers( "${NAMESPACE}:queues" );

	my $total = 0;

        for my $queue (@queues) {

            my $name = $queue;

            $name =~ s/:/_/;

            my $size = $r->llen("${NAMESPACE}:queue:${queue}") || 0;

	    $total += $size;

	    print "${name}_size.value ${size}\n";

        }

	print "total.value ${total}\n";

    }

}

elsif ($opt eq 'workers_count') {

    if ($config) {

        print "graph_title Resque Workers Count\n";

        print "graph_category system\n";

        print "graph_info This graph shows number of resque workers\n";

        print "graph_args --lower-limit 0\n";

        print "graph_vlabel workers\n";

        print "workers_count.label No. of workers\n";

        print "workers_count.type COUNTER\n";

    }

    else {

        my @workers = $r->smembers("${NAMESPACE}:workers");

        print "workers_count.value " . (scalar @workers) . "\n";

    }

}

elsif ($opt eq 'workers_working') {

    if ($config) {

        print "graph_title Resque Workers in use\n";

        print "graph_category system\n";

        print "graph_info This graph shows the \%age of resque workers busy\n";

        print "graph_args --lower-limit 0 --upper-limit 100\n";

        print "graph_vlabel %\n";

        print "workers_working.label Workers Busy\n";

        print "workers_working.type GAUGE\n";

    }

    else {

        my @workers = $r->smembers("${NAMESPACE}:workers");

        my $working = 0;

        for my $worker (@workers) {

            my $value = $r->get("${NAMESPACE}:worker:$worker") || 0;

            $working++ if $value;

        }

        my $value = scalar @workers;

        if ($value) {

            $value = $working * 100 / $value;

        }

        print "workers_working.value $value\n";

    }

}