plane property
Plane reports the event plane — the bus and the stream every accepted event is published to BEFORE any of it reaches the warehouse. It is load-bearing for the WRITE path, and it is here because its absence was a real outage: this endpoint answered 200/ok on warehouse connectivity alone while every POST /v1/event 503'd on a stream that could not bind, so 100% ingest loss was invisible to monitoring. A probe that cannot see the write path cannot report the write path.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
HealthPlane? plane;