Monitoring in Tomcat 7 can be done using the Tomcat Manager. By default, the Tomcat Manager provides the status of the server with a detailed description of requests and their status. This information is very useful to administrators at the time of troubleshooting. Apart from this, the administrator need not log in to the machine for collecting this information. It takes a minimum of 30 minutes to collect the entire information of the application, if you are checking the server status manually, but using the Tomcat Manager, you are getting it online. That's truly amazing and a great help for IT administrators.
Let's discuss the various components used for monitoring that are available in the Tomcat Manager.