Net::ZKMon - Perl extension for Apache ZooKeeper Monitoring
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About Apache ZooKeeper:

From http://hadoop.apache.org/zookeeper/: 
"ZooKeeper is a high-performance coordination service for distributed applications."

It exposes common services - such as naming, configuration management, synchronization, and group services - 
  in a simple interface so you don't have to write them from scratch. 
  You can use it off-the-shelf to implement consensus, group management, 
  leader election, and presence protocols.

Zookeeper exposes 4 letter keywords meant for simple monitoring of the ensemble service.

Please read :  
  http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_zkCommands for more details


INSTALLATION

   $ perl Makefile.PL
   $ make
   $ make test
   $ make install

OR more simply just use cpanm
  
   $ cpanm Net::ZKMon