In order to make sure the encryption secrets don't cross regional boundaries, Azure Disk Encryption needs the Key Vault and the VMs to be co-located in the same region. Create and use a Key Vault that is in the same region as the VM to be encrypted.
Reference:
https://docs.microsoft.com/en-us/azure/security/azure-security-disk-encryption-prerequisites

Reference:
https://docs.microsoft.com/en-us/powershell/module/azurerm.keyvault/new-azurermkeyvault

Check below steps in explanation for Task
Explanation:
To email an alert to a user named [email protected] if the average CPU usage of a virtual machine named VM1 is greater than 70 percent for a period of 15 minutes, you can follow these steps:
In the Azure portal, search for and select the virtual machine named VM1.
In the left pane, select Alerts.
Select New alert rule.
In the New alert rule pane, enter the following information:
Name: Enter a name for the alert rule.
Description: Enter a description for the alert rule.
Condition: Select Metric measurement.
Resource: Select the virtual machine named VM1.
Metric: Select Percentage CPU.
Operator: Select Greater than.
Threshold: Enter 70.
Aggregation type: Select Average.
Period: Select 15 minutes.
In the Actions pane, select Add action group.
In the Add action group pane, enter the following information:
Name: Enter a name for the action group.
Short name: Enter a short name for the action group.
Email recipient: Enter the email address of the user you want to receive the alert. For example, [email protected].
Select OK.