From discussion with @jfuss, it'd best to create a separate environment variable to control powertools logging level as opposed to LOG_LEVEL.

While LOG_LEVEL simplifies DX it does raise concerns if you want to isolate logging level to your Lambda function only.

Convo: aws-powertools/powertools-lambda#15 (comment)

Changes

• Create a POWERTOOLS_LOG_LEVEL environment variable
• Update all modules to use POWERTOOLS_LOG_LEVEL
• Use a Null Handler to cut noise in customers' logging
• Create top-level logger aws-lambda-powertools
• Update docs to reflect the change
• Accept an existing logger in logger setup
• Refactor Lambda Logging module to prevent root logging changes