GitHub user pykenny edited a comment on the discussion: Need help understanding 
total number of Dags oscillating on UI

When scheduler and DAG processing runs independently  (enable 
`standaline_dag_processor`), scheduler has no access to DAG definition folders, 
and need some protocol between DAG processor to know when a DAG definition gets 
removed from the file system and should be deactivated. Hence 
`dag_stale_not_seen_duration` is a bottom line to make the final decision when 
DAG processor stops sending any information about some DAG currently managed by 
the scheduler.

GitHub link: 
https://github.com/apache/airflow/discussions/44495#discussioncomment-12231354

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