[GitHub] [incubator-airflow] dlamblin commented on pull request #3873: [Airflow-2760] Decouple DAG parsing loop from scheduler loop

[GitHub]

This is either some Immutable Singleton or
```python
DagParsingSignal = namedtuple('DagParsingSignal',
                             'AGENT_HEARTBEAT MANAGER_DONE TERMINATE_MANAGER 
END_MANAGER')(
                             'agent_heartbeat', 'manager_done', 
'terminate_manager', 'end_manager')```

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