It seems that Hawkular APM is not actively maintained anymore (https://www.hawkular.org/hawkular-apm/).
What opensource APM solutions do we have currently available for Openshift Container Platform?
Can you detail the features they provide (application metrics -CPU, memory...-, application support -polyglot, container based...-, distributed tracing, etc.).
Hawkular will be replaced with Prometheus from v4.x+, refer the release notes for more informations.
As far as I know, each feature in charge of component list is as follows.
Basically the component is provided as Operator in the future.
You can get the details of each page of the components from OperatorHub.io. I hope it help you.