Mysql replication delay monitor.

Tested using:  mk-heartbeat  Ver 1.0.20 Distrib 5427 Changeset 5425
on Ubuntu 10.04 LTS.

mysql_mk_heartbeat.rb

@@ -0,0 +1,62 @@
+#!/usr/bin/env ruby
+
+# Cloudkick plugin that monitors mysql replication slave delay using maatkit's
+# mk-heartbeat. It is assumed that mk-heartbeat is running as a daemon on your master host.
+#
+# Plugin arguments:
+# 1. Location of config file for connecting to mysql.
+#    ie: /etc/maatkit/mk-heartbeat.conf
+#    File should look something like this:
+#     ---------------
+#     user=maatkit
+#     password=P@ssw0rd
+#     database=maatkit
+#     ---------------
+#
+# 2. Number of seconds of replication lag before Cloudkick should report an error.
+#
+# Author: Ian Enders / PagerDuty
+# Copyright (c) 2011 PagerDuty, Inc. <[email protected]>
+#
+# MIT License:
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+if ARGV.length != 2
+  puts "Usage: #{$0} [mk-config-file] [max-lag-in-seconds]"
+  puts "Example: #{$0} /etc/maatkit/mk-heartbeat.conf 30"
+  puts "  Would load the mysql config from /etc/maatkit/mk-heartbeat.conf and consider 30"
+  puts "  or more seconds of replication lag to be an error."
+  exit 1
+end
+
+mk_config = ARGV[0]
+max_lag_in_seconds = ARGV[1].to_i
+
+begin
+  val = `mk-heartbeat --config #{mk_config} --check`
+  lag = val.to_i
+  if lag >= max_lag_in_seconds
+    puts "status err Mysql slave is #{lag} seconds behind master."
+  else
+    puts "status ok Mysql slave is tracking master."
+  end
+  puts "metric slave_replication_delay int #{lag}"
+rescue => e
+  puts "status err Problem running mk-heartbeat plugin: #{e.message}"
+end