jason810496 commented on code in PR #60105:
URL: https://github.com/apache/airflow/pull/60105#discussion_r2711309269


##########
airflow-core/src/airflow/api_fastapi/core_api/datamodels/ui/dags.py:
##########
@@ -23,11 +23,18 @@
 from airflow.api_fastapi.core_api.datamodels.ui.dag_runs import 
DAGRunLightResponse
 
 
+class LatestRunStats(BaseModel):
+    """Stats for the latest DAG run."""
+
+    task_instance_counts: dict[str, int]
+
+
 class DAGWithLatestDagRunsResponse(DAGResponse):
     """DAG with latest dag runs response serializer."""
 
     asset_expression: dict | None
     latest_dag_runs: list[DAGRunLightResponse]
+    latest_run_stats: LatestRunStats | None = None

Review Comment:
   Apologies for the earlier suggestion. I found that annotating the field as  
`dict[TaskInstanceState, int]` should be sufficient. We don't need to introduce 
an additional data model. 
   
   ```suggestion
       latest_run_stats: dict[TaskInstanceState, int] | None = None
   ```



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