rjgoyln opened a new pull request, #73221:
URL: https://github.com/apache/airflow/pull/73221
## Summary
The default task failure email renders `{{ ti }}` in its subject. On Airflow
2 that gave the `TaskInstance` repr; the worker-side task instance is now a
Pydantic model with no textual form of its own, so the subject is its entire
field dump and no longer says which task failed:
```
Airflow alert: id=UUID('019c3eb1-…') task_id='fail'
dag_id='test-email-on-failure'
run_id='manual__2026-02-08T19:18:47.078356+00:00' try_number=1
dag_version_id=UUID('019c3ea3-…') map_index=-1 hostname='…' context_carrier={}
task=<Task(_PythonDecoratedOperator): fail>
bundle_instance=GitHubAppDagBundle(name=github-app) …
```
`__str__` rather than `__repr__`, so templates and `%s` log lines read
cleanly while a debugger or a failed assertion still shows every field.
## Scope
Only the subject; redesigning the message body is #67931.
The change is in `task-sdk` rather than `providers/smtp` because
`_send_error_email_notification` passes an explicit subject, so the bundled
notifier templates — which already name the Dag and task — never apply on this
path.
## Behavior change
The Dag-processor callback path builds the task instance without a state, so
its subject reads `[None]` there.
related: #61667
---
##### Was generative AI tooling used to co-author this PR?
- [X] Yes — Claude Code (Opus 5)
Generated-by: Claude Code (Opus 5) following [the
guidelines](https://github.com/apache/airflow/blob/main/contributing-docs/05_pull_requests.rst#gen-ai-assisted-contributions)
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