Hey Javier,
OK. I already add MySQL server. But can't obtain any metric from
it. It shows a red ball and says "No Metric Data Availabe". How can I make RHQ
obtains data from MySQL?
Showing the red ball probably means that you did not specify the correct credentials for a
MySQL user with enough rights to
read the system tables. Iirc, default is mysql/mysql, while on my install here, it was
something along the lines of root/<empty>
directly after install.
Hope this helps you further.
Heiko