Increase worker memory thresholds to avoid frequent restarts.
Increase worker memory thresholds to avoid frequent restarts.

https://bugzilla.redhat.com/show_bug.cgi?id=1391687

The prior values had not been increased to account for newer ruby
versions that utilize a generational garbage collector which consumes
more memory.

Change default worker from 200 to 400 MB.
ems_refresh_core_worker inherits this 400 MB default.

Change default queue worker from 400 to 500 MB.
generic_worker inherits this 500 MB value.

Change ems_metrics_processor_worker from 400 to 600 MB.
Change priority_worker from the old inherited queue worker value of 400
to a customized 600 MB.

Change schedule_worker from 300 to 500 MB.

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