Amazon 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.