add app_logger

[snova-johnl]

Please refer to CONTRIBUTING.md for detailed instructions.

Summary

PR Checklist

• [ ] My PR is less than 500 lines of code
• [ ] I have added sufficient comment as docstrings in my code
• [ ] I have made corresponding changes to the documentation
• [ ] I have written unit-tests to test all of my code

[github-actions[bot]]

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