AWS CloudWatch dimensions & naming

[h***@public.gmane.org]

Hello,

In the AWS, for example, there is a default metric named "ELB: Load
Balancer Metrics" and with the columns

1. LoadBalancerName
2. MetricName

My understanding is ELB is the namespace, and "Load Balancer Metrics" is
the dimensions, but why the 1st column name is "LoadBalancerName". How to
customize? If I want to create a view like this, what options I should send?

e.g.

opts = {:metric_name => 'MetricName', :namespace => 'ELB', :value => 123,
:unit => 'Milliseconds', :dimensions => [{'Name'=> 'Load Balancer Metrics',
'Value'=>'Foo'}]}

Where should I put the 1st column "LoadBalancerName" ?

Thanks.