QosHandler suspend queue limit

[LarsKrogJensen]

Jetty version(s)
12.0.11

Jetty Environment
ee10

Java version/vendor (use: java -version)
java 21.0.3 2024-04-16 LTS
Java(TM) SE Runtime Environment Oracle GraalVM 21.0.3+7.1 (build 21.0.3+7-LTS-jvmci-23.1-b37)
Java HotSpot(TM) 64-Bit Server VM Oracle GraalVM 21.0.3+7.1 (build 21.0.3+7-LTS-jvmci-23.1-b37, mixed mode, sharing)

OS type/version
Ubuntu 22.04

Description
We are using QoSHandler to protect app from being flooded with requests, but had an incident with a combination slow backend and sudden big increase in requests causing suspend queue to grow without a limit and finally OOM:ed. AWS auto scaling could not scale out quick enough, all instances died.

Suggestion is to have similar limit check to suspended requests as already exists for max active requests to prevent this scenario.

Happy to provide a PR if you consider this a valid feature of QoSHandler.

[sbordet]

Happy to provide a PR if you consider this a valid feature of QoSHandler.

Yes please.

[LarsKrogJensen]

PR ready for review

[sbordet]

Fixed by #12189.