Following are the details,

View VMs scheduled for maintenance in the portal

Once a planned maintenance wave is scheduled, you can observe the list of virtual machines that are impacted by the upcoming maintenance wave.

You can use the Azure portal and look for VMs scheduled for maintenance.

1.    Sign in to the Azure portal.

2.    In the left navigation, click Virtual Machines.

3.    In the Virtual Machines pane, click the Columns button to open the list of available columns.

4.    Select and add the following columns:

Maintenance: Shows the maintenance status for the VM. The following are the potential value

 

Value

Description

Start now

The VM is in the self-service maintenance window that lets you initiate the maintenance yourself. See below on how to start maintenance on your VM.

Scheduled

The VM is scheduled for maintenance with no option for you to initiate maintenance. You can learn of the maintenance window by selecting the Maintenance - Scheduled window in this view or by clicking on the VM.

Already updated

Your VM is already updated and no further action is required at this time.

Retry later

You have initiated maintenance with no success. You will be able to use the self-service maintenance option at a later time.

Retry now

You can retry a previously unsuccessful self-initiated maintenance.

-

Your VM is not part of a planned maintenance wave.

 

Note:

Self-service maintenance might not be available for all of your VMs. To determine if proactive redeploy is available for your VM, look for the Start now in the maintenance status. Self-service maintenance is currently not available for Cloud Services (Web/Worker Role) and Service Fabric

Self-service maintenance is not recommended for deployments using availability sets since these are highly available setups, where only one update domain is impacted at any given time.

 

For more information on Maintenance please click Here