Count the tenant's connections (no rows)

The tenant's connection histogram, computed server-side in one grouped query. Use this instead of paging GET /connections when you only need totals (dashboards, quota meters, per-application domain counts). The numbers are exact regardless of how many connections the tenant has.

by_status carries only statuses that actually occur: an absent key means zero, never "unknown". Optional ?app_id= / ?status= narrow the aggregate exactly as they narrow the list; a status outside the enum is rejected with 400.

API key only: this is a tenant-wide aggregate, so a per-application widget JWT cannot read it.