Previously, `api/service_levels.hh` includes `api/api.hh` for
accessing symbols like `api/http_context`. but these symbols are
already available in a "smaller" header -- `api/api_init.hh`. so,
in order to improve the build efficiency, let's include smaller
headers in favor of "larger" ones.
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
Closesscylladb/scylladb#22178
Introduces two endpoints with operations specific to service levels:
- switch_tenants: updates the scheduling group of all connections to be
aligned with the service level specific to the logged in user. This is
mostly legacy API, as with service levels on raft this is done
automatically.
- count_connections: for each user and for each scheduling group, counts
how many connections are assigned to that user and scheduling group.
This API is used in tests.
