Merge pull request #2217 from wimnat/feature/issue-868

Add region to doc and handle missing region parameter

cloud/amazon/ec2_metric_alarm.py

@@ -259,7 +259,6 @@ def main():
             insufficient_data_actions=dict(type='list'),
             ok_actions=dict(type='list'),
             state=dict(default='present', choices=['present', 'absent']),
-            region=dict(aliases=['aws_region', 'ec2_region']),
            )
     )
 
@@ -271,10 +270,14 @@ def main():
     state = module.params.get('state')
 
     region, ec2_url, aws_connect_params = get_aws_connection_info(module)
+    
+    if region:
         try:
             connection = connect_to_aws(boto.ec2.cloudwatch, region, **aws_connect_params)
         except (boto.exception.NoAuthHandlerFound, StandardError), e:
             module.fail_json(msg=str(e))
+    else:
+        module.fail_json(msg="region must be specified")
 
     if state == 'present':
         create_metric_alarm(connection, module)