[GitHub] [airflow] mik-laj commented on a change in pull request #6342: [AIRFLOW-5662] fix incorrect naming and batch db call for scheduler metrics

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mik-laj commented on a change in pull request #6342: [AIRFLOW-5662] fix incorrect naming and batch db call for scheduler metrics
URL: https://github.com/apache/airflow/pull/6342#discussion_r395792431
 
 

 ##########
 File path: airflow/models/pool.py
 ##########
 @@ -48,6 +50,45 @@ def get_pool(pool_name, session=None):
     def get_default_pool(session=None):
         return Pool.get_pool(Pool.DEFAULT_POOL_NAME, session=session)
 
+    @staticmethod
+    @provide_session
+    def slots_stats(session=None) -> Dict[str, Dict[str, int]]:
+        from airflow.models.taskinstance import TaskInstance  # Avoid circular import
+
+        pools = {}
+
+        pool_rows = session.query(Pool.pool, Pool.slots).all()
+        for (pool_name, total_slots) in pool_rows:
+            pools[pool_name] = {
+                "total": total_slots,
+                "used": 0,
 
 Review comment:
   What do you think about using a typed object instead of a dictionary, e.g. NamedTuple? In Python 3.8, we have TypedDict, but we still support Python 3.6+: https://www.python.org/dev/peps/pep-0589/

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