Currently, we have a total of 10 unhealthy hosts under a specific ELB,
hosts are in different AZs.
aws_elb_un_healthy_host_count_average metric returns 10 unhealthy hosts for
each AZ:
aws_elb_un_healthy_host_count_average{load_balancer_name="foo",availability_zone="us-west-2c",}
10.0
aws_elb_un_healthy_host_count_average{load_balancer_name="foo",availability_zone="us-west-2b",}
10.0
aws_elb_un_healthy_host_count_average{load_balancer_name="foo",availability_zone="us-west-2a",}
10.0
therefore, sum by (load_balancer_name)
(aws_elb_un_healthy_host_count_average{load_balancer_name="foo"}) returns
30 unhealthy hosts, which is incorrect (should be 10)
On the other hand, aws_elb_healthy_host_count_average returns just one
value, without availability_zone label, and therefore returns a correct
number.
Using cloudwatch_exporter-0.8.0 image
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