Enhance the Status with a severity:
Ex.:
ERR10002:
statusCode: 401
code: ERR10002
message: MISSING_AUTH_TOKEN
description: No Authorization header or the token is not bearer type

enhanced to:
ERR10002:
statusCode: 401
code: ERR10002
severity: ERROR
message: MISSING_AUTH_TOKEN
description: No Authorization header or the token is not bearer type

with severity set to a custom value. (ex: INFO, WARN, ERROR, SEVERE)
Default value, for backwards compatibility: ERROR