s3 suffix filter overlap exception

[tjbaker]

Using the same key_filter suffix in different notifications throws a suffix filter overlap exception. Why does it matter if the same suffix is specified in more than one notification?

Exception
One or more suffix filters overlap one to each other log, log.

s3:

  elb_s3_integration:
    bucket: the_bucket
    notifications:

      prod_elb_on_create:
        lambda: elb.ELBLogs
        events:
          - "s3:ObjectCreated:*"
        key_filters:
          prefix: PROD
          suffix: log

      stg_elb_on_create:
        lambda: elb.ELBLogs
        events:
          - "s3:ObjectCreated:*"
        key_filters:
          prefix: STG
          suffix: log