Single-region failover only: The current implementation supports failover between two AWS regions within a single AWS account. Multi-account DR is not supported.

Manual failback required: After failover, returning traffic to the primary cluster requires manual FQDN restoration and terraform apply on the primary workspace.

Lambda cold start window: While the cooldown is now SSM-persisted, the Lambda function still has a brief cold start initialization period (~1-2s) before SSM can be queried.

Single-cluster failover: The Lambda fails over to exactly one secondary cluster. Multi-secondary or active-active configurations are not supported.