How can i fetch ALB tag details from the exporter metrics

[akilandt]

Hi
I am looking for ways to fetch ALB tag details along with other metrics. i am able to fetch other required metrics. how can i fetch the tag details of ALB.
I used below format but the tags are fetched as a separate resource which is not what i needed.

• aws_namespace: AWS/ApplicationELB
  aws_metric_name: TargetResponseTime
  aws_dimensions: [TargetGroup,LoadBalancer]
  aws_dimension_select:
  LoadBalancer: [LoadbalancerName]
  aws_tag_select:
  tag_selections:
  Tags: [required tag here]
  resource_type_selection: elasticloadbalancing:loadbalancer
  resource_id_dimension: LoadBalancerName
  aws_statistics: [Average]

Tag details as seperate resource:

TYPE aws_resource_info gauge aws_resource_info{job="aws_applicationelb",instance="",arn="arndetails",target_group_name="",tag_Name="tagname",} 1.0

I want the tags to be fetched with below metrics details instead of fetching separately like mentioned above.

Example metrics:

# TYPE aws_applicationelb_target_response_time_average gauge
aws_applicationelb_target_response_time_average{job="aws_applicationelb",instance="",target_group="targetgroup",load_balancer="loadbalancer",} 0.008573922485207101

[matthiasr]

Unfortunately this is impractical to do in the exporter. Adding tags directly into the metrics means different metrics can and will have different label dimensions, which makes them difficult to handle generically. The aws_resource_info metric is a solution that contains this problem to one metric.

Fortunately, you can combine these metrics at query time. See for example this article on how to do that. As a general design rule in Prometheus, we prefer this split and combination at query time, because it avoids a lot of complexity, both in query writing and client design.