Using rabbitmq's queue to do hpa, access to custom.metrics fails - kubernetes

Question

Can be successfully accessed through api,It can clearly obtain information，by /apis/custom.metrics.k8s.io/v1beta1
kubectl get --raw /apis/custom.metrics.k8s.io/v1beta1/namespaces/default/services/rabbitmq-exporter/rabbitmq_queue_messages_ready?metricLabelSelector=queue%3Dtest-1 | jq .
{
"kind": "MetricValueList",
"apiVersion": "custom.metrics.k8s.io/v1beta1",
"metadata": {
"selfLink": "/apis/custom.metrics.k8s.io/v1beta1/namespaces/default/services/rabbitmq-exporter/rabbitmq_queue_messages_ready"
},
"items": [
{
"describedObject": {
"kind": "Service",
"namespace": "default",
"name": "rabbitmq-exporter",
"apiVersion": "/v1"
},
"metricName": "rabbitmq_queue_messages_ready",
"timestamp": "2020-02-17T13:50:20Z",
"value": "14",
"selector": null
}
]
}
HPA file
apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
metadata:
name: test-hpa
namespace: default
spec:
scaleTargetRef:
apiVersion: extensions/v1beta1
kind: Deployment
name: test
minReplicas: 1
maxReplicas: 5
metrics:
- type: Object
object:
metric:
name: "rabbitmq_queue_messages_ready"
selector:
matchLabels:
"queue": "test-1"
describedObject:
apiVersion: "custom.metrics.k8s.io/v1beta1"
kind: Service
name: rabbitmq-exporter
target:
type: Value
value: 4
Error message
Name: test-hpa
Namespace: default
Labels: <none>
Annotations: kubectl.kubernetes.io/last-applied-configuration:
{"apiVersion":"autoscaling/v2beta2","kind":"HorizontalPodAutoscaler","metadata":{"annotations":{},"name":"test-hpa","namespace":"defa...
CreationTimestamp: Mon, 17 Feb 2020 21:38:08 +0800
Reference: Deployment/test
Metrics: ( current / target )
"rabbitmq_queue_messages_ready" on Service/rabbitmq-exporter (target value): <unknown> / 4
Min replicas: 1
Max replicas: 5
Deployment pods: 1 current / 0 desired
Conditions:
Type Status Reason Message
---- ------ ------ -------
AbleToScale True SucceededGetScale the HPA controller was able to get the target's current scale
ScalingActive False FailedGetObjectMetric the HPA was unable to compute the replica count: unable to get metric rabbitmq_queue_messages_ready: Service on default rabbitmq-exporter/object metrics are not yet supported
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Warning FailedComputeMetricsReplicas 97s (x12 over 4m22s) horizontal-pod-autoscaler Invalid metrics (1 invalid out of 1), last error was: failed to get object metric value: unable to get metric rabbitmq_queue_messages_ready: Service on default rabbitmq-exporter/object metrics are not yet supported
Warning FailedGetObjectMetric 82s (x13 over 4m22s) horizontal-pod-autoscaler unable to get metric rabbitmq_queue_messages_ready: Service on default rabbitmq-exporter/object metrics are not yet supported