You are running the brand new NuCache!
NuCache is working. NuCache says: {{vm.status}}
This lets you refresh the status, or collect snapshots (after running a CLR GC).
This lets you rebuild the database cache (status above), ie the content of the cmsContentNu table. Rebuilding can be expensive.
This lets you reload the in-memory and local file cache by entirely reloading it from the data in the cmsContentNu table, but it does not rebuild that table. This is relatively fast. Triggers the reload on all servers in an LB environment.