'Disable CloudWatch monitoring for the supplied instance.
:type instance_id: list of string
:param instance_id: The instance id
:type dry_run: bool
:param dry_run: Set to True if the operation should not actually run.
:rtype: list
:return: A list of :class:`boto.ec2.instanceinfo.InstanceInfo`'

def unmonitor_instances(self, instance_ids, dry_run=False):

    params = {}
    self.build_list_params(params, instance_ids, 'InstanceId')
    if dry_run:
        params['DryRun'] = 'true'
    return self.get_list('UnmonitorInstances', params, [('item', InstanceInfo)], verb='POST')
