What needs to be enabled or installed in order for the CPU and Disk/Memory values to be reported within a system?
Which version of NI Linux-RT did you install on your sbRIO?
CPU, disk, and memory tags should be available out of the box with recent versions of Linux-RT. However, if you're using Linux RT 20.0 or newer, you might need to investigate and tweak your server's HTTP settings.
Start by logging into your server and checking the NI Web Server Configuration application: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q0000019c7cCAA. Ensure that your "Preferred host name" is visible to your sbRIO.
I had the same issue at https://forums.ni.com/t5/NI-Linux-Real-Time-Discussions/How-to-enable-SystemLink-health-tags-for-Lin...