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AWS vpc-lattice documentation change

Service: vpc-lattice · 2026-03-22 · Documentation low

File: vpc-lattice/latest/ug/what-is-vpc-lattice.md

Summary

Added documentation for Availability Zone affinity routing behavior

Security assessment

Describes operational availability improvements rather than security controls. While availability impacts security posture, there's no explicit security vulnerability or security feature being documented.

Diff

diff --git a/vpc-lattice/latest/ug/what-is-vpc-lattice.md b/vpc-lattice/latest/ug/what-is-vpc-lattice.md
index 703350d10..78e2459ad 100644
--- a//vpc-lattice/latest/ug/what-is-vpc-lattice.md
+++ b//vpc-lattice/latest/ug/what-is-vpc-lattice.md
@@ -142,0 +143,5 @@ The second layer enables users to attach security groups to the association betw
+**Availability Zone affinity**
+    
+
+VPC Lattice supports Availability Zone (AZ) affinity for routing traffic. When a client sends a request to VPC Lattice, VPC Lattice responds with the IP address for the service or resource from the same AZ as the client. If that AZ is unavailable, VPC Lattice responds with IP addresses from other AZs. From VPC Lattice to the target, the routing is to targets, which might be distributed across AZs. Additionally, there are no inter-AZ data transfer charges in VPC Lattice.
+