podinfo应用暴露了一个名为http_requests_total的自定义metric。Prometheas适配器删除_total后缀，并将度量标记为计数器度量(counter metric)。 从自定义metrics API中获取每秒请求总数:
kubectl get --raw "/apis/custom.metrics.k8s.io/v1beta1/namespaces/default/pods/*/http_requests" | jq .
查询结果：
{
"kind": "MetricValueList",
"apiVersion": "custom.metrics.k8s.io/v1beta1",
"metadata": {
"selfLink": "/apis/custom.metrics.k8s.io/v1beta1/namespaces/default/pods/*/http_requests"
},
"items": [
{
"describedObject": {
"kind": "Pod",
"namespace": "default",
"name": "podinfo-6b86c8ccc9-kv5g9",
"apiVersion": "/__internal"
},
"metricName": "http_requests",
"timestamp": "2018-01-10T16:49:07Z",
"value": "901m"
},
{
"describedObject": {
"kind": "Pod",
"namespace": "default",
"name": "podinfo-6b86c8ccc9-nm7bl",
"apiVersion": "/__internal"
},
"metricName": "http_requests",
"timestamp": "2018-01-10T16:49:07Z",
"value": "898m"
}
]
}
