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Posted to commits@airflow.apache.org by "aga98 (via GitHub)" <gi...@apache.org> on 2025/10/06 07:35:01 UTC
[I] Task Logs in UI No Longer Support Color/Styling (Regression from Airflow 2) [airflow]
aga98 opened a new issue, #56421:
URL: https://github.com/apache/airflow/issues/56421
### Apache Airflow version
3.1.0
### If "Other Airflow 2 version" selected, which one?
_No response_
### What happened?
In Airflow 3.0.0+, task logs displayed in the Airflow UI no longer render colored or styled messages.
In Airflow 2.x, if a task log message contained ANSI escape codes (e.g., from using the Python logging or logs generated by dbt), the Airflow UI (specifically the Task Log view) would render these colors, significantly improving the readability and triage speed for log analysis.
With the switch to structured logging (JSON format) in Airflow 3+, the logs are now rendered from the structured data, and any color/style information present in the original log message is logged as raw.
Check this example in Airflow 3.1.0:
<img width="1419" height="239" alt="Image" src="https://github.com/user-attachments/assets/101cf003-d912-4680-9982-440192c73125" />
The color codes `[34m` and `[0m` are displayed and ignored for the formatting of the log.
This also affects formatted logs coming from dbt executions. For example:
<img width="1089" height="111" alt="Image" src="https://github.com/user-attachments/assets/d9a3aa43-d5e5-4352-a335-b60ec3108f4b" />
### What you think should happen instead?
The Airflow UI should re-introduce the functionality to display styled/colored log messages in the Task Log view.
Since the logs are now structured, the ideal solution would be to re-enable ANSI Code Interpretation: If the log message (event field in the JSON log) contains ANSI escape codes, the UI should be able to interpret and apply these styles to the rendered message, as it did in Airflow 2.
Check the same example in Airflow 2.9.3
<img width="1327" height="244" alt="Image" src="https://github.com/user-attachments/assets/dea3f854-6fe8-4c45-84cf-998d7ad1f5d8" />
And for dbt:
<img width="1061" height="92" alt="Image" src="https://github.com/user-attachments/assets/67dfb374-6638-4e0c-973c-0de8a8b26871" />
### How to reproduce
The following DAG can be added to Airflow to validate how the color codes are not rendered correctly:
```python
import logging
from datetime import datetime
from airflow.sdk import dag, task
# for Airflow 2
# from airflow.decorators import dag, task
log = logging.getLogger(__name__)
@dag(
dag_id="color_log_reproduction_dag",
start_date=datetime(2025, 1, 1),
schedule=None,
catchup=False,
)
def check_log_colors():
"""DAG to test rendering of ANSI-colored logs in the Airflow 3 UI."""
@task
def log_colored_messages():
# ANSI Codes: \033[91m = Red, \033[93m = Yellow, \033[0m = Reset
log.error("\033[91mThis ERROR message should be RED in the UI.\033[0m")
log.warning("\033[93mThis WARNING message should be YELLOW in the UI.\033[0m")
log.info( "This line contains \033[91mRED\033[0m text mid-message.")
log_colored_messages()
check_log_colors()
```
Output for Airflow 3:
<img width="1271" height="138" alt="Image" src="https://github.com/user-attachments/assets/f8c895f9-95ce-4f16-a88a-448558dc0d75" />
Output for Airflow 2:
<img width="724" height="98" alt="Image" src="https://github.com/user-attachments/assets/8a62283e-7b50-44ae-9738-0a6145804cf2" />
### Operating System
Debian GNU/Linux 12 (bookworm)
### Versions of Apache Airflow Providers
_No response_
### Deployment
Official Apache Airflow Helm Chart
### 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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Re: [I] Task Logs in UI No Longer Support Color/Styling (Regression from Airflow 2) [airflow]
Posted by "RoyLee1224 (via GitHub)" <gi...@apache.org>.
RoyLee1224 commented on issue #56421:
URL: https://github.com/apache/airflow/issues/56421#issuecomment-3373315937
Happy to help with this one💪
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Re: [I] Task Logs in UI No Longer Support Color/Styling (Regression from Airflow 2) [airflow]
Posted by "potiuk (via GitHub)" <gi...@apache.org>.
potiuk closed issue #56421: Task Logs in UI No Longer Support Color/Styling (Regression from Airflow 2)
URL: https://github.com/apache/airflow/issues/56421
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Re: [I] Task Logs in UI No Longer Support Color/Styling (Regression from Airflow 2) [airflow]
Posted by "guan404ming (via GitHub)" <gi...@apache.org>.
guan404ming commented on issue #56421:
URL: https://github.com/apache/airflow/issues/56421#issuecomment-3375299299
@RoyLee1224 Nice, just assigned!
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Re: [I] Task Logs in UI No Longer Support Color/Styling (Regression from Airflow 2) [airflow]
Posted by "boring-cyborg[bot] (via GitHub)" <gi...@apache.org>.
boring-cyborg[bot] commented on issue #56421:
URL: https://github.com/apache/airflow/issues/56421#issuecomment-3370294783
Thanks for opening your first issue here! Be sure to follow the issue template! If you are willing to raise PR to address this issue please do so, no need to wait for approval.
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