Altimeter discovers available regions to scan using botocore.session.Session.get_available_regions , however the data from this call is simply a json file deployed with botocore. This PR adds a validation step against https://api.regional-table.region-services.aws.a2z.com/index.json - if any service regions are found in this json which are not in boto, a warn level log line is emitted indicating boto should be upgraded.