This question seems to come up often - added this to the FAQ.

On Tue, Nov 05, 2013 at 04:02:09PM +0000, Roman Garcia wrote:
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB