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AWS AmazonECS documentation change

Service: AmazonECS · 2026-05-22 · Documentation low

File: AmazonECS/latest/developerguide/managed-instances-infrastructure-optimization.md

Summary

Added limitation notice about underutilized instance detection not supporting Spot instances.

Security assessment

The change clarifies feature limitations for Spot instances but contains no security-related content or references to vulnerabilities.

Diff

diff --git a/AmazonECS/latest/developerguide/managed-instances-infrastructure-optimization.md b/AmazonECS/latest/developerguide/managed-instances-infrastructure-optimization.md
index 8fdb6bee3..58723fe09 100644
--- a//AmazonECS/latest/developerguide/managed-instances-infrastructure-optimization.md
+++ b//AmazonECS/latest/developerguide/managed-instances-infrastructure-optimization.md
@@ -35,0 +36,4 @@ Analyzes task distribution across instances to identify opportunities for better
+###### Important
+
+Underutilized instance detection is currently not supported for Spot instances. If you use Spot instances with Amazon ECS Managed Instances, the infrastructure optimization feature will detect and remove idle instances (instances with no running tasks), but will not consolidate workloads from underutilized Spot instances.
+