FrankYang0529 opened a new pull request, #73020:
URL: https://github.com/apache/airflow/pull/73020
## Why
- `GET /api/v2/eventLogs` returns `task_display_name: null` for REST API
actions on a single task instance, such as marking it as success from the UI.
- #59973 made `Log.task_instance` join on `dag_id`, `task_id`, `run_id` and
`map_index`, but `action_logging` never stores `map_index`. These rows have a
NULL map index and can never match a task instance.
- The same rows show an empty Map Index column in the UI audit log, and
filtering by map index does not find them.
## How
- `action_logging` records the map index from the request path, query or
body. It commits the row before the endpoint validates the request, so it
leaves out any value that is not an integer, is below -1, or does not fit the
column.
- Each audit row still matches at most one task instance, because `(dag_id,
task_id, run_id, map_index)` is unique. This keeps the fix from #59973, which
stopped one audit row from matching every task instance with the same task_id.
## Verification
1. Add demo dag
```bash
mkdir -p files/dags
cat > files/dags/audit_log_map_index_demo.py <<'EOF'
from __future__ import annotations
from airflow.sdk import dag, task
@dag(schedule=None, tags=["audit-log-demo"])
def audit_log_map_index_demo():
@task(task_display_name="Load orders")
def load_orders():
return "orders loaded"
@task(task_display_name="Load shard")
def load_shard(shard: int):
return shard
load_orders()
load_shard.expand(shard=[0, 1, 2])
audit_log_map_index_demo()
EOF
```
2. Start Airflow
```
breeze start-airflow --db-reset
```
3. Trigger Dag and mark "Load shard" as failed.
4. Check audit log.
On main branch, the `Map Index` column is empty although `map_index` is in
`Extra` field. The API shows null for `map_index` and `task_display_name`
fields.
<img width="1312" height="171" alt="Screenshot 2026-09-12 at 1 18 43 PM"
src="https://github.com/user-attachments/assets/4e0f9adc-7b9c-4ce2-820d-a4eeba39809b";
/>
<img width="1265" height="305" alt="Screenshot 2026-09-12 at 1 19 11 PM"
src="https://github.com/user-attachments/assets/580589ff-842a-40c1-b359-388819d1de03";
/>
On this branch, we get expected values.
<img width="1312" height="172" alt="Screenshot 2026-09-12 at 1 21 41 PM"
src="https://github.com/user-attachments/assets/4cb8e1d6-f717-497f-b636-795427ac7128";
/>
<img width="1263" height="301" alt="Screenshot 2026-09-12 at 1 21 53 PM"
src="https://github.com/user-attachments/assets/9f28a563-10c2-420f-a58c-e65b87df049b";
/>
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