Symptoms
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The RAM, CPU, Disk I/O tab is missing in Service Plans > <Service plan name>.
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The Resource Controller (Cgroups) is missing in Tools & Settings > Services Management.
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The Plesk Cgroups Manager extension was installed.
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The Resource Controller (Cgroups) component is marked as installed in Tools & Settings > Updates and Upgrades > Resource Controller (Cgroups).
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The Resource Controller (Cgroups) has the Off value on the Tools & Settings > License Management page.
Cause
Missing license for Plesk Cgroups Manager Extension.
Resolution
Plesk Cgroups Manager is a paid extension, and license key for it should be purchased separately or as a part of the Hosting Pack.
Warning: check the requirements for Cgroups Manager before purchasing the license.
