[Hadoop Wiki] Update of "Chukwa Configuration" by andyk

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The following page has been changed by andyk:
http://wiki.apache.org/hadoop/Chukwa_Configuration

New page:
Chukwa comes with templates for all configuration files. These files are in the conf directory and are named <conf file name>.template. You should be

'''Required configuration files'''
conf/collectors - new line delimited list of collectors. This file is used by startup and shutdown scripts to determine where to run Chukwa collectors and is also used by Chukwa agents to find collectors to send their data to.
conf/slaves - a list of hosts in the cluster on which to run the Chukwa agent daemon.
conf/chukwa-env.sh - environment variables required to run Chukwa.
conf/chukwa-collectors-conf.xml - collector specific settings (e.g. port number to listen for agents on, which file system to store data in, etc.)
conf/chukwa-agents-conf.xml - agent specific settings.

'''Optional'''
conf/alert.conf - a list of e-mail addresses to which chukwa alerts should be sent.