我在这里使用Kafka Helm 图表。我也在尝试水平吊舱自动缩放。
我在templates文件夹中添加了一个hpa.yaml文件，如下所示。

apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
  name: kafka-hpa
spec:
  scaleTargetRef:
    apiVersion: extensions/v1beta1
    kind: Deployment
    name: {{ include "kafka.fullname" . }}
minReplicas: {{ .Values.replicas }}
maxReplicas: 5
metrics:
- type: Resource
  resource:
    name: cpu
    targetAverageUtilization: 50
- type: Resource
  resource:
    name: memory
    targetAverageValue: 8000Mi

我也用kind:statefulset尝试了上面的yaml，但同样的问题仍然存在。
我的意图是最初有3个Kafka吊舱，并根据上面提到的cpu和内存目标值将其扩展到5个。
然而，hpa得到部署，但根据我的理解，它无法读取度量，因为当前使用情况显示未知，如下所述。

NAME        REFERENCE                          TARGETS                          MINPODS   MAXPODS   REPLICAS   AGE
kafka-hpa   Deployment/whopping-walrus-kafka   <unknown>/8000Mi, <unknown>/50%   3         5         0          1h .

我是赫尔姆和Kubernetes的新手，所以我想我的理解可能有问题。
我还部署了metrics服务器。

$ kubectl get deployments
NAME                             DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
metrics-server                   1         1         1            1           1d
whopping-walrus-kafka-exporter   1         1         1            1           1h

豆荚产量

$ kubectl get pods
NAME                                              READY     STATUS    RESTARTS   AGE
metrics-server-55cbf87bbb-vm2v5                   1/1       Running   0          15m
whopping-walrus-kafka-0                           1/1       Running   1          1h
whopping-walrus-kafka-1                           1/1       Running   0          1h
whopping-walrus-kafka-2                           1/1       Running   0          1h
whopping-walrus-kafka-exporter-5c66b5b4f9-mv5kv   1/1       Running   1          1h
whopping-walrus-zookeeper-0                       1/1       Running   0          1h

我想巨大的海象Kafka吊舱扩大到5负载，然而，没有相应的部署。
statefulset输出

$ kubectl get statefulset
NAME                        DESIRED   CURRENT   AGE
original-bobcat-kafka       3         2         2m
original-bobcat-zookeeper   1         1         2m

当hpa.yaml中的kind为statefulset时，descripe hpa的输出。

$ kubectl describe hpa
Name:                                                  kafka-hpa
Namespace:                                             default
Labels:                                                <none>
Annotations:                                           <none>
CreationTimestamp:                                     Fri, 18 Jan 2019 12:13:59 +0530
Reference:                                             StatefulSet/original-bobcat-kafka
Metrics:                                               ( current / target )
  resource memory on pods:                             <unknown> / 8000Mi
  resource cpu on pods  (as a percentage of request):  <unknown> / 5%
Min replicas:                                          3
Max replicas:                                          5
Conditions:
  Type         Status  Reason          Message
  ----         ------  ------          -------
  AbleToScale  False   FailedGetScale  the HPA controller was unable to get the target's current scale: no matches for kind "StatefulSet" in group "extensions"
Events:
  Type     Reason          Age                From                       Message
  ----     ------          ----               ----                       -------
  Warning  FailedGetScale  15s (x17 over 8m)  horizontal-pod-autoscaler  no matches for kind "StatefulSet" in group "extensions"

当hpa.yaml中的kind为deployment时，descripe hpa的输出。

$ kubectl describe hpa
Name:                                                  kafka-hpa
Namespace:                                             default
Labels:                                                <none>
Annotations:                                           <none>
CreationTimestamp:                                     Fri, 18 Jan 2019 12:30:07 +0530
Reference:                                             Deployment/good-elephant-kafka
Metrics:                                               ( current / target )
  resource memory on pods:                             <unknown> / 8000Mi
  resource cpu on pods  (as a percentage of request):  <unknown> / 5%
Min replicas:                                          3
Max replicas:                                          5
Conditions:
  Type         Status  Reason          Message
  ----         ------  ------          -------
  AbleToScale  False   FailedGetScale  the HPA controller was unable to get the target's current scale: could not fetch the scale for deployments.extensions good-elephant-kafka: deployments/scale.extensions "good-elephant-kafka" not found
Events:
  Type     Reason          Age   From                       Message
  ----     ------          ----  ----                       -------
  Warning  FailedGetScale  9s    horizontal-pod-autoscaler  could not fetch the scale for deployments.extensions good-elephant-kafka: deployments/scale.extensions "good-elephant-kafka" not found

度量服务器pod的输出

$ kubectl describe pods metrics-server-55cbf87bbb-vm2v5
Name:           metrics-server-55cbf87bbb-vm2v5
Namespace:      default
Node:           docker-for-desktop/192.168.65.3
Start Time:     Fri, 18 Jan 2019 11:26:33 +0530
Labels:         app=metrics-server
            pod-template-hash=1176943666
            release=metrics-server
Annotations:    <none>
Status:         Running
IP:             10.1.0.119
Controlled By:  ReplicaSet/metrics-server-55cbf87bbb
Containers:
  metrics-server:
    Container ID:  docker://ee4b3d9ed1b15c2c8783345b0ffbbc565ad25f1493dec0148f245c9581443631
    Image:         gcr.io/google_containers/metrics-server-amd64:v0.3.1
    Image ID:      docker-pullable://gcr.io/google_containers/metrics-server-amd64@sha256:78938f933822856f443e6827fe5b37d6cc2f74ae888ac8b33d06fdbe5f8c658b
    Port:          <none>
    Host Port:     <none>
    Command:
      /metrics-server
      --kubelet-insecure-tls
      --kubelet-preferred-address-types=InternalIP
      --logtostderr
    State:          Running
  Started:      Fri, 18 Jan 2019 11:26:35 +0530
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
  /var/run/secrets/kubernetes.io/serviceaccount from metrics-server-token-d2g7b (ro)
Conditions:
  Type           Status
  Initialized    True 
  Ready          True 
  PodScheduled   True 
Volumes:
  metrics-server-token-d2g7b:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  metrics-server-token-d2g7b
    Optional:    false
    QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
             node.kubernetes.io/unreachable:NoExecute for 300s
Events:          <none>

各位，如果我有什么地方出了问题，请随时澄清我的理解。
在此方面的帮助将不胜感激。