How Application Manager works

How Application Manager works

Hi,

Can some one point me to some documents or help me understand the internal working of application manager.
Say for example, In tomcat server what does response time in ms mean? Is it the time taken for a request coming from a different client to get processed or does the application manager ping the server to measure the response time? What exactly is happening if we dont have the agent installed on the tomcat server side?

Thanks.







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