fix(screenshots): downgrade screenshot timeout logs from ERROR to WARNING

[aminghadersohi]

SUMMARY

Selenium timeout exceptions during screenshot generation are expected operational behavior (slow-loading dashboards, network latency, etc.) and not actual server errors. These were being logged at ERROR level via logger.exception(), creating significant noise in log aggregators like Datadog.

Changes:

• webdriver.py: Change logger.exception() to logger.warning(..., exc_info=True) for all three timeout scenarios (page load, dashboard draw, chart load)
• webdriver.py: Fix bare except: clause to use except Exception:
• webdriver.py: Reorder outer except blocks so specific exceptions (TimeoutException, StaleElementReferenceException, WebDriverException) are caught before the generic Exception handler — previously these were unreachable dead code
• dashboards/api.py: Downgrade logger.error() to logger.warning() in the thumbnail endpoint's catch-all handler that returns 404 (inconsistent to log ERROR for a 404 response)

BEFORE/AFTER SCREENSHOTS OR COVERAGE URL

N/A - logging level changes only, no UI impact.

TESTING INSTRUCTIONS

1. Trigger a dashboard thumbnail generation for a dashboard that takes a long time to load
2. Check that selenium timeout messages are logged at WARNING level instead of ERROR
3. Verify that the ScreenshotImageNotAvailableException still returns 404 properly
4. Unit tests: pytest tests/unit_tests/utils/webdriver_test.py (16/17 pass - the 1 failure is pre-existing in Playwright test, unrelated to these changes)

ADDITIONAL INFORMATION

• These changes directly address Datadog [remove] exclusion filters for selenium timeout errors
• The outer except block reordering fixes a bug where except Exception caught everything before the more specific handlers, making them dead code
• logger.warning(..., exc_info=True) preserves the full stack trace for debugging while correctly classifying the severity

🤖 Generated with Claude Code

[bito-code-review]

Code Review Agent Run #3711ce

Actionable Suggestions - 0

Review Details

• Files reviewed - 2 · Commit Range: 8f51f1b..8f51f1b

  • superset/dashboards/api.py
  • superset/utils/webdriver.py
• Files skipped - 0
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  • Astral Ruff (Static Code Analysis) - ✔︎ Successful

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Codecov Report

❌ Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.43%. Comparing base (6fdaa8e) to head (8f51f1b).
⚠️ Report is 103 commits behind head on master.

Files with missing lines	Patch %	Lines
superset/utils/webdriver.py	0.00%	9 Missing ⚠️
superset/dashboards/api.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #38130       +/-   ##
===========================================
+ Coverage        0   66.43%   +66.43%     
===========================================
  Files           0      670      +670     
  Lines           0    51441    +51441     
  Branches        0     5803     +5803     
===========================================
+ Hits            0    34177    +34177     
- Misses          0    15869    +15869     
- Partials        0     1395     +1395     

Flag	Coverage Δ
hive	41.42% <0.00%> (?)
mysql	64.54% <0.00%> (?)
postgres	64.62% <0.00%> (?)
presto	41.44% <0.00%> (?)
python	66.41% <0.00%> (?)
sqlite	64.21% <0.00%> (?)
unit	100.00% <ø> (?)

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