The verbosity flag controls how the logger is configured.

Current verbosity behavior is:

• nothing : no logging
• -v : WARN (global)
• -vv : INFO (global)
• -vvv : DEBUG (global)

After going through various scenarios and using the logging output, I decided a more useful approach would be:

• nothing : WARNING (aws_encryption_sdk_cli), CRITICAL (root)
• -v : INFO (aws_encryption_sdk_cli), CRITICAL (root)
• -vv : DEBUG (aws_encryption_sdk_cli), CRITICAL (root)
• -vvv : DEBUG (aws_encryption_sdk_cli), INFO (root)
• -vvvv : DEBUG (aws_encryption_sdk_cli), DEBUG (root)

WARN is always on for safety reasons: we want users to always be aware of WARN events.