Most of production failures in my company in last few years come from people making mistakes in yaml indentation.
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Cake day: September 20th, 2025
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In yaml a mistake in indentation can easily result in a business error without config becoming invalid.
Writing too much complex configs in files is a problem too ofc, we ended up moving a lot of stuff like that to a DB lately.
I’m not a fan of indentation being logically meaningful not just in yaml. If you mess up indentation in python you can also get a technically valid code that’s wrong logically.