Stackdriver adapter cannot use googlecloud exporters metrics

[justsomecorporateuser]

Component(s)

exporter/googlecloud

Describe the issue you're reporting

Trying to set up HPA using Opentelemetry Operator, with Auto-instrumentation and Collector sending metrics to GCP monitoring.
I have https://github.com/GoogleCloudPlatform/k8s-stackdriver/tree/master/custom-metrics-stackdriver-adapter configured to pick the metrics and HPA set using external metrics

I can see the googlecloud exported metrics in Metrics Explorer fine.. (but with 50th, 95th, 99 percentile division ). When i try to set a HPA, it gives a warning:

unable to fetch metrics from external metrics API: Expected metric of type DoubleValue or Int64Value, but received TypedValue: { 0xc000d44900 [] []}

That is basically what custom-metrics-stackdriver-adapter docs say, must be either DOUBLE or INT64.

Question is this: Do i have some way to influence the metrics type for the metrics sent to GCP monitoring in Collector configs?

[github-actions]

Pinging code owners:

• exporter/googlecloud: @aabmass @dashpole @jsuereth @punya @damemi @psx95

%s See Adding Labels via Comments if you do not have permissions to add labels yourself.

[justsomecorporateuser]

Problem was that my HPA did not have reducer.. once that was there, got it working

apiVersion: autoscaling/v2 
kind: HorizontalPodAutoscaler
metadata:
  name: spring-boot-hpa
  namespace: test
spec:
  minReplicas: 1
  maxReplicas: 5
  metrics:
  - type: External
    external:
      metric:
        name: workload.googleapis.com|http.server.request.duration
        selector:
          matchLabels:
            metric.labels.service_name: spring-boot-example
            reducer: "REDUCE_PERCENTILE_99"
      target:
        type: AverageValue
        averageValue: "1"
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: spring-boot-example