我已经找到答案:认认真真用老师的资料一步步操作;不要下载https://github.com/helm/charts.git,用老师的deep-in-kubernetes/12-monitoring/prometheus-operator 就好。对于已经下载并安装出现错误的,我提供两条命令,重置后再按步骤重来就好:
$ kubectl delete crd servicemonitors.monitoring.coreos.com prometheusrules.monitoring.coreos.com prometheuses.monitoring.coreos.com alertmanagers.monitoring.coreos.com
$ helm reset
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