in functions/finalize/finalize.py [0:0]
def handler(event, context):
    print(event)
    func_name = event['function-name']
    version = event['new-version']
    alias_name = event['alias-name']
    # reset the routing config and set the primary version to the new version
    update_weight(func_name, alias_name, version)
    return event