This plugin integrates
JavaMelody system monitoring tool into grails application. When a grails application is installed with grails-melody plugin, you will be able to monitor the application at http://localhost:8080/<YourContext>/monitoring.

The goal of JavaMelody is to monitor Java or Java EE applications servers in QA and production environments. It is not a tool to simulate requests from users, it is a tool to measure and calculate statistics on real operation of an application depending on the usage of the application by users.
A few things you might want to know:
- grails-melody plugin overwrite original grails 'dataSource' bean in spring context with a JavaMelody datasource proxy.
- grails-melody plugin use groovy meta programming to intercept grails services method calls.
The plugin copies a GrailsMelodyConfig.groovy file into your project's grails-app/conf directory. All JavaMelody parameters described at
http://code.google.com/p/javamelody/wiki/UserGuide#5._Optional_parameters
can be configured in this file with 'javamelody.' prefix. For example, use
javamelody.disabled = true
to disable the JavaMelody monitoring.
JavaMelody uses URIs to resolve HTTP requests. This means that
/book/show/1 and
/book/show/23
will resolve as different requests. While that's desirable in some cases, often you want the statistics to be gathered for the show action, irrespective of parameters. In that case, add the following configuration to GrailsMelodyConfig.groovy and the above URIs will show up as /book/show/$.
javamelody.'http-transform-pattern' = '\\d+' //filter out numbers from URI
Similar issue comes up for SQL monitoring - use a similar Regex to filter it.
javamelody.'sql-transform-pattern' = '\\d+'