Its handler dereferences long chain of objects to get to the value it needs. There's shorter way.
Also, the endpoint in question is not unregistered on stop.
Closesscylladb/scylladb#21279
* github.com:scylladb/scylladb:
api: Make get_highest_supported_sstable_version use proper service
api: Move system::get_highest_supported_sstable_version set/unset
api: Scaffold for sstables-format-selector