We are contacting you regarding your Network Load Balancer(s) using the Sticky sessions feature. Starting on March 15, 2021, we will be deploying a change that will route new connections from the same client to the same backend target regardless of the Availability Zone your client connects through. Prior to this change, the new connections could potentially route to a different backend target per Availability Zone depending on the Availability Zone your client connects through. This change should not impact your application as NLB will behave as originally intended, and no action is required at this time.