曾向集群中添加了数台机器； 如果pod在原本在集群中的机器上，那么是有监控日志的，在新机器上则没有。我查看node-
exporter 的日志， 有如下的报错：
time="2020-04-15T09:33:33Z" level=error msg="ERROR: diskstats collector failed after 0.064089s: invalid line for /host/proc/diskstats for sdf" source="collector.go:132"
time="2020-04-15T09:33:35Z" level=error msg="ERROR: diskstats collector failed after 0.099908s: invalid line for /host/proc/diskstats for sdh" source="collector.go:132"
time="2020-04-15T09:34:33Z" level=error msg="ERROR: diskstats collector failed after 0.049030s: invalid line for /host/proc/diskstats for sdf" source="collector.go:132"
time="2020-04-15T09:34:35Z" level=error msg="ERROR: diskstats collector failed after 0.002296s: invalid line for /host/proc/diskstats for dm-3" source="collector.go:132"
time="2020-04-15T09:35:33Z" level=error msg="ERROR: diskstats collector failed after 0.049945s: invalid line for /host/proc/diskstats for nbd10" source="collector.go:132"
time="2020-04-15T09:35:35Z" level=error msg="ERROR: diskstats collector failed after 0.097297s: invalid line for /host/proc/diskstats for sdg" source="collector.go:132"
time="2020-04-15T09:36:33Z" level=error msg="ERROR: diskstats collector failed after 0.047688s: invalid line for /host/proc/diskstats for nbd3" source="collector.go:132"
time="2020-04-15T09:36:35Z" level=error msg="ERROR: diskstats collector failed after 0.110862s: invalid line for /host/proc/diskstats for sdb" source="collector.go:132"
time="2020-04-15T09:37:34Z" level=error msg="ERROR: diskstats collector failed after 0.252825s: invalid line for /host/proc/diskstats for dm-2" source="collector.go:132"
time="2020-04-15T09:37:35Z" level=error msg="ERROR: diskstats collector failed after 0.002645s: invalid line for /host/proc/diskstats for sde" source="collector.go:132"
time="2020-04-15T09:38:33Z" level=error msg="ERROR: diskstats collector failed after 0.002065s: invalid line for /host/proc/diskstats for nbd4" source="collector.go:132"
time="2020-04-15T09:38:35Z" level=error msg="ERROR: diskstats collector failed after 0.093610s: invalid line for /host/proc/diskstats for sde" source="collector.go:132"
