Jobs does not run in ci.eclipse.org/jakartaee-tck Jenkins instance - (issue 1276 made public)

Summary

Related to #1276 (closed).

Only 2-3 jobs can be run from the jenkins instance ci.eclipse.org/jakartaee-tck at a time. It is suspected that new nodes are not being available for running the jobs.

Steps to reproduce

trigger 3 or more jobs at a time

What is the current bug behavior?

the jobs in queue are never executed when 3 of them are being executed.

What is the expected correct behavior?

More jenkins jobs should be run at the same time.