Are you trying to mount a directory onto a file

unknown: Are you trying to mount a directory onto a file (or vice-versa)? Check if the specified host path exists and is the expected type

挂载子目录（subpath）时，mountPath 需要写文件的绝对的路径，而不是目录。

        - mountPath: /etc/prometheus/prometheus.yml
          name: prometheus-yml
          subPath: prometheus.yml

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# Are you trying to mount a directory onto a file