sodonnel commented on PR #3781:
URL: https://github.com/apache/ozone/pull/3781#issuecomment-1305870740
```
"tag.datanode.1" : "ozone-datanode-3.ozone_default",
"tag.Hostname.1" : "39160451dea0",
"TrackedUnderReplicatedDN.1" : 1,
"tag.datanode.2" : "ozone-datanode-3.ozone_default",
"tag.Hostname.2" : "39160451dea0",
"TrackedSufficientlyReplicatedDN.2" : 0,
"tag.datanode.3" : "ozone-datanode-3.ozone_default",
"tag.Hostname.3" : "39160451dea0",
"TrackedPipelinesWaitingToCloseDN.3" : 0,
"tag.datanode.4" : "ozone-datanode-3.ozone_default",
"tag.Hostname.4" : "39160451dea0",
"TrackedUnhealthyContainersDN.4" : 0
```
Its a bit strange that we have 4 tags for the same DN. The way I'd expect
this to work is we have 1 tag per DN, and then the 4 metrics (under,
sufficiently, pipelines, unhealthy) all sharing that tag.
I **think** this is due to the way you are adding the tags in `getMetrics` -
you are building a new tag per metric, rather than a tag per DN and then
tagging all its metrics with that tag.
It might be easier if you simply stored a Set or Map of
`ContainerStateInWorkflow` inside the metrics class, as then you can iterate it
on a host by host basis.
Example of what I mean, plus more simplifications -
https://github.com/sodonnel/hadoop-ozone/commit/673109c0403c69265fd100499373002e37ddfbc0
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