Update howto-cluster-runtime-upgrade-template.md

Filling in parameters and pre-checks.

Author: bartpinto

articles/operator-nexus/howto-cluster-runtime-upgrade-template.md

@@ -28,3 +28,69 @@ Runtime changes are categorized as follows:
 2. The latest `networkcloud` CLI extension is required. It can be installed following the steps listed in [Install CLI Extension](howto-install-cli-extensions.md).
 3. Subscription access to run the Azure Operator Nexus Network Fabric (NF) and Network Cloud (NC) CLI extension commands.
 4. Target Cluster must be healthy in a running state.
+
+## Required Parameters:
+- <ENVIRONMENT> - Instance Name
+- <AZURE_REGION> - Azure Region of Instance
+- <CUSTOMER_SUB_NAME>: Subscription Name
+- <CUSTOMER_SUB_TENANT_ID>  // From 'az account show'
+- <CUSTOMER_SUB_ID>: Subscription ID
+- <CLUSTER_NAME>: Cluster Name
+- <CLUSTER_RG>: Cluster Resource Group
+- <CLUSTER_RID>: Cluster ARM ID
+- <CLUSTER_KEYVAULT_ID>: Cluster Keyvault ARM ID
+- <CLUSTER_MRG>: Cluster Managed Resource Group
+- <CLUSTER_CONTROL_BMM>: Cluster Control plane baremetalmachine
+- <CLUSTER_RUNTIME_VERSION>: Runtime version for upgrade
+- <START_TIME>: Planned start time of upgrade
+- <DURATION>: Estimated Duration of upgrade
+- <NFC_NAME>: Associated NFC
+- <CM_NAME>: Associated CM
+- <ETCD_LAST_ROTATION_DATE>: Control plane etcd credential last rotation date
+- <ETCD_ROTATION_DAYS>: Control plane etcd credential next rotation period
+- <FABRIC_NAME>: Associated Fabric
+- <NEXUS_VERSION>: Target upgrade version
+
+## Pre-Checks
+
+1. Very last/next rotation date on etcd credential will not occur during upgrade on each control plane Bare Metal Machine (BMM):
+   - Check in Azure portal from the following path: `Clusters` -> <CLUSTER_NAME> -> `Resources` -> `Bare Metal Machines`
+   - Select each BMM with `control-plane` under the `Role`: <CLUSTER_CONTROL_BMM>  -> `JSON View`
+   - Validate the `lastRotationTime` and `rotationPeriodDays` under the `etcd credential` section:
+     ```
+     {
+	    "lastRotationTime": "<ETCD_LAST_ROTATION_DATE>",
+        "rotationPeriodDays": <ETCD_ROTATION_DAYS>,
+        "secretType": "etcd credential"
+	 }
+	 ```
+	 
+	 >[!Important]
+     > If the upgrade will occur within three days of the next `etcd credential` rotation (<ETCD_LAST_ROTATION_DATE> + <ETCD_ROTATION_DAYS>), contact Miscrosoft Support to complete a manual rotation before starting the upgrade.
+	 
+2. Validate the provisioning and detailed status for the Cluster Manager (CM) and Cluster.
+   
+   Set up the subscription, CM, and Cluster parameters:
+   ```  
+   export SUBSCRIPTION_ID=<CUSTOMER_SUB_ID>
+   export CM_RG=<CM_RG>
+   export CM_NAME=<CM_NAME>
+   export CLUSTER_RG=<CLUSTER_RG>
+   export CLUSTER_NAME=<CLUSTER_NAME>
+   ```
+
+   Check that the CM is in `Succeeded` for `Provisioning state`:
+   ```
+   az networkcloud clustermanager show -g $CM_RG --resource-name $CM_NAME --subscription $SUBSCRIPTION_ID -o table
+   ```
+
+   Check the Cluster status `Detailed status` is `Running`:
+   ```  
+   az networkcloud cluster show -g $CLUSTER_RG --resource-name $CLUSTER_NAME --subscription $SUBSCRIPTION_ID -o table
+   ```
+
+   >[!Note]
+   > If CM `Provisioning state` is not `Succeeded` and Cluster `Detailed status` is not `Running` stop the upgrade until issues are resolved.
+
+3. Review Operator Nexus Release notes for required checks and configuration updates not included in this document.
+