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AWS rtb-fabric documentation change

Service: rtb-fabric · 2025-12-07 · Documentation low

File: rtb-fabric/latest/userguide/managed-endpoints.md

Summary

Added warning about ensuring ASG hosts marked IN_USE are healthy and available

Security assessment

The change emphasizes operational reliability by ensuring traffic routing to healthy hosts, but there is no evidence of addressing a security vulnerability or describing security-specific capabilities. This is a reliability/availability concern rather than a security fix.

Diff

diff --git a/rtb-fabric/latest/userguide/managed-endpoints.md b/rtb-fabric/latest/userguide/managed-endpoints.md
index d8928923c..fb3d3d270 100644
--- a//rtb-fabric/latest/userguide/managed-endpoints.md
+++ b//rtb-fabric/latest/userguide/managed-endpoints.md
@@ -127,0 +128,4 @@ The role must also allow the following permissions in its permissions policies:
+###### Important
+
+For RTB Fabric to approriately route traffic to healthy hosts, the provided ASG must **only** have hosts listed as IN_USE if they are available to take traffic. Ensure that hosts which are unhealthy, inactive, or running other services are not set as IN_USE in the provided ASG. 
+