Merge pull request #77324 from iainfoulds/aksconcurrentops

[AKS] Add troubleshooting section for concurrent operations

Author: PRMerger8

articles/aks/troubleshooting.md

@@ -113,4 +113,16 @@ Follow the *Before you begin* steps in the appropriate doc to correctly register
 Naming restrictions are implemented by both the Azure platform and AKS. If a resource name or parameter breaks one of these restrictions, an error is returned that asks you provide a different input. The following common naming guidelines apply:
 
 * The AKS *MC_* resource group name combines resource group name and resource name. The auto-generated syntax of `MC_resourceGroupName_resourceName_AzureRegion` must be no greater than 80 chars. If needed, reduce the length of your resource group name or AKS cluster name.
-* The *dnsPrefix* must start and end with alphanumeric values. Valid characters include alphanumeric values and hyphens (-). The *dnsPrefix* can't include special characters such as a period (.).
+* The *dnsPrefix* must start and end with alphanumeric values. Valid characters include alphanumeric values and hyphens (-). The *dnsPrefix* can't include special characters such as a period (.).
+
+## I’m receiving errors when trying to create, update, scale, delete or upgrade cluster, that operation is not allowed as another operation is in progress.
+
+*This troubleshooting assistance is directed from aka.ms/aks-pending-operation*
+
+Cluster operations are limited when a previous operation is still in progress. To retrieve a detailed status of your cluster, use the `az aks show -g myResourceGroup -n myAKSCluster -o table` command. Use your own resource group and AKS cluster name as needed.
+
+Based on the output of the cluster status:
+
+* If the cluster is in any provisioning state other than *Succeeded* or *Failed*, wait until the operation (*Upgrading / Updating / Creating / Scaling / Deleting / Migrating*) terminates. When the previous operation has completed, re-try your latest cluster operation.
+
+* If the cluster has a failed upgrade, follow the steps outlined [I'm receiving errors that my cluster is in failed state and upgrading or scaling will not work until it is fixed](#im-receiving-errors-that-my-cluster-is-in-failed-state-and-upgrading-or-scaling-will-not-work-until-it-is-fixed).