OHS must have the mpm_prefork_module directive disabled so as not conflict with the worker directive used to limit the number of allowed simultaneous requests.
Profiles that employ this XCCDF Rule
Node 2
The content of the drawer really is up to you. It could have form fields, definition lists, text lists, labels, charts, progress bars, etc. Spacing recommendation is 24px margins. You can put tabs in here, and can also make the drawer scrollable.
Capacity
Modules