wongelz commented on issue #15399:
URL: https://github.com/apache/airflow/issues/15399#issuecomment-822124897
@jedcunningham Looks like the `slots_stats` method in `pool.py` may be
under-reporting the number of running/queued slots here:
```
state_count_by_pool = (
session.query(TaskInstance.pool, TaskInstance.state,
func.count())
.filter(TaskInstance.state.in_(list(EXECUTION_STATES)))
.group_by(TaskInstance.pool, TaskInstance.state)
).all()
```
I think the query should be:
```
session.query(TaskInstance.pool, TaskInstance.state,
func.sum(TaskInstance.pool_slots))
```
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