pawellrus opened a new issue, #24329:
URL: https://github.com/apache/airflow/issues/24329
### Apache Airflow version
2.3.1
### What happened
Grid for any DAG stop loading for some unknow issue. Instead I get exception
in console and webserver's logs.
### What you think should happen instead
`{
"detail": "'__type' is a required property\n\nFailed validating 'required'
in schema['properties']['tasks']['items']['properties']['retry_delay']:\n
{'description': 'Time delta',\n 'nullable': True,\n 'properties':
{'__type': {'type': 'string'},\n 'days': {'type':
'integer'},\n 'microseconds': {'type': 'integer'},\n
'seconds': {'type': 'integer'}},\n 'required': ['__type',
'days', 'seconds', 'microseconds'],\n 'type': 'object'}\n\nOn
instance['tasks'][0]['retry_delay']:\n {'days': 0,\n 'microseconds':
0,\n 'objectType': 'TimeDelta',\n 'seconds': 300}",
"status": 500,
"title": "Response body does not conform to specification",
"type":
"https://airflow.apache.org/docs/apache-airflow/2.3.1/stable-rest-api-ref.html#section/Errors/Unknown";
}`
### How to reproduce
_No response_
### Operating System
Oracle Linux Server 7.6
### Versions of Apache Airflow Providers
apache-airflow-providers-amazon==3.4.0
apache-airflow-providers-celery==2.1.4
apache-airflow-providers-cncf-kubernetes==4.0.2
apache-airflow-providers-docker==2.7.0
apache-airflow-providers-elasticsearch==3.0.3
apache-airflow-providers-ftp==2.1.2
apache-airflow-providers-google==7.0.0
apache-airflow-providers-grpc==2.0.4
apache-airflow-providers-hashicorp==2.2.0
apache-airflow-providers-http==2.1.2
apache-airflow-providers-imap==2.2.3
apache-airflow-providers-microsoft-azure==3.9.0
apache-airflow-providers-mysql==2.2.3
apache-airflow-providers-odbc==2.0.4
apache-airflow-providers-postgres==4.1.0
apache-airflow-providers-redis==2.0.4
apache-airflow-providers-sendgrid==2.0.4
apache-airflow-providers-sftp==2.6.0
apache-airflow-providers-slack==4.2.3
apache-airflow-providers-sqlite==2.1.3
apache-airflow-providers-ssh==2.4.4
### Deployment
Other Docker-based deployment
### Deployment details
_No response_
### Anything else
_No response_
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [X] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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