'Retrieve all the metadata tags associated with your account.
:type filters: dict
:param filters: Optional filters that can be used to limit
the results returned.  Filters are provided
in the form of a dictionary consisting of
filter names as the key and filter values
as the value.  The set of allowable filter
names/values is dependent on the request
being performed.  Check the EC2 API guide
for details.
:type dry_run: bool
:param dry_run: Set to True if the operation should not actually run.
:type max_results: int
:param max_results: The maximum number of paginated instance
items per response.
:rtype: list
:return: A list of :class:`boto.ec2.tag.Tag` objects'

def get_all_tags(self, filters=None, dry_run=False, max_results=None):

    params = {}
    if filters:
        self.build_filter_params(params, filters)
    if dry_run:
        params['DryRun'] = 'true'
    if (max_results is not None):
        params['MaxResults'] = max_results
    return self.get_list('DescribeTags', params, [('item', Tag)], verb='POST')
