If some business logic is called inside the JSP, does the JSP time include the business logic execution time?
Yes, JSP:Average Response Time, is the Average response time of the _jspService() methods of all the JSPs executing in the JVM. The Response Times of all the individual JSPs are averaged to calculate this value.
If a redirection is done inside the JSP, does the JSP time include the time of the redirected JSP/Servlet? Or the time is shown in the separated metric corresponding to the redirected component?
Yes, it includes the the time of the redirected page. As mentioned above, Individual JSP Response Times are available in the nodes marked with the JSP names.
Why does the peak time in Frontends and in JSPs not match? We suppose that Servlet time are also shown as Frontend time. Is that right?
As per the above explanation, these will not match. This is because Servlet time also includes in Frontend time.