The Average Response Time (ms) Value averages all "finished" invocations of a method or component. If the execution of the methods have not completed, it will report as zero.
Why are individual JSP metrics showing a Responses Per Interval value greater than 0, but the Average Response Time is 0?
The Average Response Time (ms) can be 0 if the average time is less than 1 ms. Introscope deals in integer math, so anything less than zero ms (such as 0.99) will be reported as zero.