Amazon S3 Replication adds support for metrics and notifications
Amazon S3 Replication now provides detailed metrics and notifications to monitor the status of object replication between buckets. You can monitor replication progress by tracking bytes pending, operations pending, and replication latency between your source and destination buckets using the S3 management console or Amazon CloudWatch. You can also set up S3 Event Notifications to receive replication failure notifications to quickly diagnose and correct configuration issues. S3 Replication metrics and notifications help you closely monitor replication progress. Previously, S3 Replication metrics and notifications were available with S3 Replication Time Control (S3 RTC). Beginning now, they can be enabled for all replication rules.
Source:: Amazon AWS