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Add necessity of metrics-server for HPA (#9729)
* Add necessity of metrics-server for HPA Current HPA doc1 mentions metrics-server like For resource metrics, this is the metrics.k8s.io API, generally provided by metrics-server. It can be launched as a cluster addon. The metrics.k8s.io API is mandatory for HPA, so the above means metrics-server needs to be launched for HPA. However it is difficult to understand that requirement because the above seems metrics-server as just a addon, and that is described on small section. In addition, many people are facing HPA issue that fetching metrics doesn't work on the internet like $ kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE nginx Deployment/nginx <unknown>/50% 1 3 0 7s The above sample "<unknown>" shows HPA feature cannot get current metrics due to metrics-server doesn't work fine. This adds necessity of metrics-server for HPA directly to solve the problem. fixes: #9728 * Copyedit
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