CPU and Concurrent Connection Usage is a legacy CloudLinux-specific cPanel interface. Current cPanel Feature Manager documentation marks this feature as deprecated and directs CloudLinux servers to use Metrics → Resource Usage instead.
If the older interface is still enabled on a server, it can display CloudLinux account resource information. For current deployments, use Resource Usage when it is available.
Both interfaces depend on CloudLinux and server feature configuration, so neither is guaranteed to appear on every cPanel account.