# A runner that blocks: the port is open, liveness is UP, readiness is OUT_OF_SERVICE


--- while the runner is blocked ---
has SpringApplication.run() returned?  false
GET /ping                        -> 200 pong
GET /actuator/health/liveness    -> 200 {"status":"UP"}
GET /actuator/health/readiness   -> 503 {"status":"OUT_OF_SERVICE"}

--- after the runner returned ---
has SpringApplication.run() returned?  true
GET /actuator/health/readiness   -> 200 {"status":"UP"}

--- trace ---
runner: started on platform thread app-main, now waiting (think: warming a cache for 40 s)
runner: finished, returning to SpringApplication.run