On 28/11/2024 09:26, Owner wrote:
Hi Tomcat Devs,
Hope you guys are having a great day. I'm a new developer to this area so
do let me know if I have any misconceptions or errors in my thinking.
I am currently using Tomcat as an embedded web server within a Spring Boot
Application, and I utilise Micrometer to expose Tomcat metrics, such as
tomcat_servlet_request_seconds.
I was thinking if it'd be useful to include a metric that tracks the
latency experienced in terms of time spent in the Tomcat queue. I
understand that each request is added to a TaskQueue (default
implementation) by the poller thread, and the internal executor service
created will assign a thread to each task. However, the current metrics
only track the time after polling from the queue, and passed down through
filters etc to the dispatcher servlet. (tomcat_servlet_request_seconds).
In reality, I understand the total delay experienced by the client should
include the time spent in the queue as well, since there could be a case
where there are no available threads to service incoming requests.
Would this metric serve a good use case? Or are there already similar
metrics out there? I'm currently on Tomcat 9.0.63 if that helps.
Sounds useful to me. I'd certainly look at any proposed patch. Whether
it gets merged will depend on various factors (complexity, performance,
etc).
Mark
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