prometheus-plugin: Memory leak still

Can we please reopen #160 as 2.0.8 is still not resolving it?

Oct 20, 2020 7:51:49 AM hudson.init.impl.InstallUncaughtExceptionHandler handleException
WARNING: Caught unhandled exception with ID cb34e4da-4856-4d56-bd16-fd4e13a5621b
java.lang.OutOfMemoryError: Java heap space

Oct 20, 2020 7:52:29 AM hudson.init.impl.InstallUncaughtExceptionHandler handleException
WARNING: Caught unhandled exception with ID 6f9e8576-0195-423c-aa0d-90ec157768f5
java.lang.OutOfMemoryError: Java heap space

Oct 20, 2020 7:59:35 AM hudson.model.AsyncPeriodicWork doRun
INFO: Periodic background build discarder thread is still running. Execution aborted.
Oct 20, 2020 8:03:31 AM org.jenkinsci.plugins.workflow.job.WorkflowRun finish