Note that upgrades to ECK 3.1 cause a restart (#2634)

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Co-authored-by: David Kilfoyle <[email protected]>

Author: pebrc

deploy-manage/upgrade/orchestrator/upgrade-cloud-on-k8s.md

@@ -101,8 +101,11 @@ This will update the ECK installation to the latest binary and update the CRDs a
 Upgrading the operator results in a one-time update to existing managed resources in the cluster. This potentially triggers a rolling restart of pods by Kubernetes to apply those changes. The following list contains the ECK operator versions that would cause a rolling restart after they have been installed.
 
 ```
-1.6, 1.9, 2.0, 2.1, 2.2, 2.4, 2.5, 2.6, 2.7, 2.8, 2.14
+1.6, 1.9, 2.0, 2.1, 2.2, 2.4, 2.5, 2.6, 2.7, 2.8, 2.14, 3.1 <1>
 ```
+
+1. The restart when upgrading to version 3.1 happens only for applications using [stack monitoring](/deploy-manage/monitor/stack-monitoring/eck-stack-monitoring.md).
+
 ::::{note}
 Stepping over one of these versions, for example, upgrading ECK from 2.6 to 2.9, still triggers a rolling restart.
 ::::