RHEL 10 recently removed tracer, so I am looking for how to replace its functionality in Cockpit. Unfortunately all of the modes require a lot of parsing and guesswork (the output is not really machine readable), see RHEL-56139 (which was wontfixed).

One aspect is "which services need to be restarted, for which we call dnf needs-restarting --services. This normally outputs a list of unit names, but sometimes the output looks like this:

Waiting for process with pid 2848 to finish
podman.service

These both go to stdout and break scripts which act on the output. Please put the "Waiting for.." on stderr to make this more robust.