cAdvisor Prometheus container_cpu_load_average_10s具有两个值

我有一个要监视的在数字海洋上运行的kubernetes集群。当查询公开的cAdvisor指标时，<apiserver>/api/v1/nodes/<nodename>/proxy/metrics/cadvisor我得到container_cpu_load_average_10s的以下结果

# HELP container_cpu_load_average_10s Value of container cpu load average over the last 10 seconds.
# TYPE container_cpu_load_average_10s gauge
container_cpu_load_average_10s{container="",id="/",image="",name="",namespace="",pod=""} 0 1579564900287
container_cpu_load_average_10s{container="",id="/docker/0da952be93af76ef4f89c82d39ffc994814386013b0313db0e376ba8c1ca52ec",image="gcr.io/google-containers/hyperkube:v1.16.2",name="kubelet",namespace="",pod=""} 0 1579564899268
container_cpu_load_average_10s{container="",id="/kubepods",image="",name="",namespace="",pod=""} 0 1579564900316
container_cpu_load_average_10s{container="",id="/kubepods/besteffort",image="",name="",namespace="",pod=""} 0 1579564903221
container_cpu_load_average_10s{container="",id="/kubepods/besteffort/pod05e648ab-0d69-46e7-97f5-53fa5547e631",image="",name="",namespace="default",pod="sh2-74cdb7f89b-7wmn2"} 0 1579564889468
container_cpu_load_average_10s{container="",id="/kubepods/besteffort/pod1d3d6f5c-8b8f-47df-87e1-e6796b6c8cac",image="",name="",namespace="kube-system",pod="kubelet-rubber-stamp-7f966c6779-9pj2x"} 0 1579564897907
container_cpu_load_average_10s{container="",id="/kubepods/besteffort/pod35f81ba8-c778-4771-8103-ca6a1f1df3b3",image="",name="",namespace="kube-system",pod="cilium-operator-d5cd7d758-jlc7g"} 0 1579564902427
container_cpu_load_average_10s{container="",id="/kubepods/besteffort/pod7c42ac9d-14e2-4773-9f6b-78745e065d98",image="",name="",namespace="default",pod="sh-68d446d656-pr6lw"} 0 1579564893074
container_cpu_load_average_10s{container="",id="/kubepods/besteffort/pod87c517f4-be8d-4eeb-b550-7edd7b6629c7",image="",name="",namespace="ingress",pod="haproxy-ingress-c5fc9f5d-zbmc7"} 0 1579564903152
container_cpu_load_average_10s{container="",id="/kubepods/besteffort/poda137a036-0931-4d38-a39e-24269eda4558",image="",name="",namespace="kube-system",pod="metrics-server-7cdf9b7694-9ngsb"} 0 1579564906312

指标值实际上是两个值，第一个始终为0，然后为1579564906312。

我是普罗米修斯的新手，我认为一个指标只能有一个值，但显然管理者会暴露两个值。这是bug还是我对普罗米修斯一无所知？如果不是bug，那么我应该如何对待它，因为prometheus浏览器仅显示第一个值为0的值。