Daniel Gies created AIRFLOW-568:
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             Summary: Task status circles on overview page show double count if 
a DAG is running
                 Key: AIRFLOW-568
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-568
             Project: Apache Airflow
          Issue Type: Bug
          Components: webserver
    Affects Versions: Airflow 2.0
            Reporter: Daniel Gies


If you use `airflow backfill` to create a the first DagRun of a DAG, the 
overview page at /admin will show exactly double the correct counts for the 
task status bubbles.  This is happening because the task_stats view is taking 
the union of 2 sets of statuses, the stats of the DagRun with the highest 
execution date, plus the stats of all running DagRuns.  Because the running 
DagRun is also the highest execution date its tasks get double counted.



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