SR: Current log replay delay (s)
Root cause: 
The oldest not yet replayed data within the replication replay queue is very old, leading to a potential long delay in processing after a potential switch over.  
 
Resolution steps: 
 Refer to SAP Note 1999880 for details on SAP HANA System Replication to ensure the replication replay queue is processed regularly. 
Metrics  are green and no issue in replication.