Middleware 11g performance guide

I was searching for some documentation about MDS errors and I came across this online help Oracle® Fusion Middleware Performance Guide 11g Release 1. Just check this out, dont know how long this page will be available ( it is beta).
For example you can use this console logger in your JDeveloper 11g application. It opens automatically when you start your web application.

To activate this just add these context parameters to your web.xml
<br /><context-param><br /><param-name>oracle.adf.view.rich.profiler.ENABLED</param-name><br /><param-value>true</param-value><br /></context-param><br /><context-param><br /><param-name>oracle.adf.view.rich.LOGGER_LEVEL</param-name><br /><param-value>FINE</param-value><br /></context-param><br /><context-param><br /><param-name>oracle.adf.view.rich.LOG_WRITERS</param-name><br /><param-value>AdfConsoleLogWriter</param-value><br /></context-param><br />