'Return all global limit information.'

def _index(self, req, filter_result=False, max_image_meta=True):

    context = req.environ['nova.context']
    context.can(limits_policies.BASE_POLICY_NAME)
    project_id = req.params.get('tenant_id', context.project_id)
    quotas = QUOTAS.get_project_quotas(context, project_id, usages=False)
    abs_limits = {k: v['limit'] for (k, v) in quotas.items()}
    builder = limits_views.ViewBuilder()
    return builder.build(abs_limits, filter_result=filter_result, max_image_meta=max_image_meta)
