When looking out for expensive Cloudwatch Log groups that could indicate no expiry being set, one log group in a development account stuck out. Breaking down the usage type, the costs were mainly for PutLogEvents API calls that are related to log ingestion.
A test/dev Lamba was set with very verbose logging. 240kb json documents being written out ~1million times a day and costing >$1400 per month. The dump was probably put in for debugging but never commented out so stayed there for 2 years. In comparison, the monthly PutLogEvents costs of the equivalent production Lambda is <$100 a month.
Updating the Lambda and setting a retention period resolved the issues.
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