Tomcat metrics

Q&A
1

Hi guys,

I'm playing with the metrics on a Bonita 7.10.1.

I'd like to know the metrics to get the time of tomcat to elaborate a http request and send a response.

I checked in the documentation and only found explanations about bonita metrics, not tomcat ones, are they somewhere on tomcat website?

I tried this one tomcat_servlet_request_seconds_sum and tomcat_servlet_request_seconds_count but they're always 0, so I don't think it's the correct one.

Also the tomcat_global_request_seconds_count doesn't seem a good option.

Thanks in advance!

2

Hello,

Bonita exposes Tomcat metrics through micrometer TomcatMetrics implementation.

There you can browse the metric keys provided to find the most suitable one for you.
Have a look at counters of the category tomcat.global.request.* and tomcat.servlet.request.*

Hope this helps

Emmanuel

3

Hello,

First of all, don't take master branch of Micormeter code source: Bonita 7.9-7.10-7.11 uses version 1.3.2 so use this link instead.

In the code, you can see some metrics under the name tomcat.global.request: this is the name under which Micrometer registers them. For Timer metrics, Micrometer automatically add seconds to this prefix, and creates 2 metrics from it: count and sum.

The fact that you see them in snake case (with _ characters) instead of the . notation comes from Prometheus (I assume you use Prometheus) that changes the names.

As for the detailed description of each metric, I could only try to guess, as Micrometer documentation is not explained, so I prefer not say inaccurate guessing.

Regards,

4

Thanks for your answer.

I don't find in TomcatMetrics a list of the exposed tomcat metrics, such as "tomcat_global_request_seconds_count"

where does this name come from, Bonita or TomcatMetrics?

also a google on this term doesn't give any results.

Anyway I'll try to give my interpretation to some of the metrics, could you please provide feedback and answer to the "?" ? 

tomcat_global_request_seconds_count: Number of global requests per second

tomcat_global_request_seconds_sum: ?

tomcat_servlet_request_max_seconds:  Among all the requests that arrive to Tomcat in one second, the one that last the most is given

tomcat_servlet_request_seconds_count: Number of servlets executed per second (does servlet include rest api?)

tomcat_servlet_request_seconds_max: Max time to elaborate a servlet per seconds (does servlet include rest api?)

 

Thanks!

 

 

 

5

They are fully Micrometer's metrics. Bonita only exposes them, without anything Bonita-specific.