All possible states that a Task Instance can be in. Note that None is also allowed, so always use this in a type hint with Optional.
REMOVED(value:'removed')SCHEDULED(value:'scheduled')QUEUED(value:'queued')RUNNING(value:'running')SUCCESS(value:'success')RESTARTING(value:'restarting')FAILED(value:'failed')UP_FOR_RETRY(value:'up_for_retry')UP_FOR_RESCHEDULE(value:'up_for_reschedule')UPSTREAM_FAILED(value:'upstream_failed')SKIPPED(value:'skipped')DEFERRED(value:'deferred')AWAITING_INPUT(value:'awaiting_input')