def get_vmss_rolling_upgrades(access_token, subscription_id, resource_group, vmss_name):
endpoint = '<STR_LIT>'.join([get_rm_endpoint(),<EOL>'<STR_LIT>', subscription_id,<EOL>'<STR_LIT>', resource_group,<EOL>'<STR_LIT>', vmss_name,<EOL>'<STR_LIT>', COMP_API])<EOL>return do_get(endpoint, access_token)<EOL>
Get details of the latest VM scale set rolling upgrade.

    Args:
        access_token (str): A valid Azure authentication token.
        subscription_id (str): Azure subscription id.
        resource_group (str): Azure resource group name.
        vmss_name (str): Name of the virtual machine scale set.

    Returns:
        HTTP response. JSON body of rolling upgrades status.