# Amazon CloudWatch Metrics for DRS
CloudWatch Metrics for DRS

The following are CloudWatch metrics for DRS:
+  **TotalSourceServerCount** - number of source servers 
+  **LagDuration** - the age of the latest consistent snapshot, in seconds 
+  **Backlog** - the amount of data yet to be synced, in bytes. 
+  **DurationSinceLastSuccessfulRecoveryLaunch** - the amount of time that has passed since the last Drill or Recovery instance launch in seconds. 
+  **ElapsedReplicationDuration** - the cumulative amount of time this server has been replicating for in seconds.