Added plugin for ARIS

This plugin allows munin users to monitor server instances of the ARIS
locative game engine. See http://arisgames.org

plugins/aris/aris_players

@@ -0,0 +1,38 @@
+#!/usr/bin/php
+# Author David Gagnon <djgagnon@wisc.edu>
+# Plugin to monitor ARIS users
+#
+# Parameters:
+#
+# 	config   (required)
+# 	
+#
+#%# family=manual
+
+
+<?php
+$aris_db_host='localhost';
+$aris_db_name='db';
+$aris_db_user='user';
+$aris_db_pass='password';
+
+if ($argv[1]=='config'){
+    print "graph_title ARIS active players\n";
+    print "graph_vlabel Players Count\n";
+    print "graph_category ARIS\n";
+    print "players.label player count\n";
+
+    exit;
+}
+
+$sqlLink = mysql_connect($aris_db_host,$aris_db_user,$aris_db_pass) or die('MySQL authenticaiton error');
+mysql_select_db($aris_db_name) or die('MySQL Wrong Scheme Error');
+
+    $query = 'SELECT COUNT(DISTINCT player_id) AS count FROM player_log WHERE timestamp BETWEEN DATE_SUB(NOW(), INTERVAL 5 MINUTE) AND NOW()';
+    $result = mysql_query($query);
+    $numCurrentPlayersObject = mysql_fetch_object($result);
+    $numCurrentPlayers = $numCurrentPlayersObject->count;
+
+echo 'players.value '. $numCurrentPlayers;
+
+?>