adoroszlai opened a new pull request, #7784:
URL: https://github.com/apache/ozone/pull/7784

   ## What changes were proposed in this pull request?
   
   1. Refactor `VolumeInfoMetrics` to fetch volume usage with a single call, 
instead of getting individual values separately.
   2. Fix wrong `Capacity` and `TotalCapacity`.  `Used + Available != 
Capacity`, because `Used` only includes the space used by the HDDS data dir.  
`Capacity` is already queried from the filesystem, so we should display that.
   
   https://issues.apache.org/jira/browse/HDDS-12165
   
   ## How was this patch tested?
   
   Started `ozone` compose cluster, created keys using Freon.
   
   Checked Datanode web UI, verified that volume info is present.
   
   Before:
   
   
![before](https://github.com/user-attachments/assets/80324d9d-2b8f-492d-a31b-017aee44c041)
   
   After:
   
   
![after](https://github.com/user-attachments/assets/105ec394-ec46-473d-bb57-b4578694d8ad)
   
   Checked metrics in JMX endpoint, verified that metrics keys are the same as 
before.  Values are similar, except capacity, which is correct with the patch 
(`TotalCapacity` matches the value reported by `df` (times 1024, since it 
reports 1K blocks)).
   
   Before:
   
   ```
   {
     "name" : "Hadoop:service=HddsDatanode,name=VolumeInfoMetrics-/data/hdds",
     "modelerType" : "VolumeInfoMetrics-/data/hdds",
     "tag.Context" : "ozone",
     "tag.StorageType" : "DISK",
     "tag.DatanodeUuid" : "9ab8037b-59f4-4f99-b762-8a33649c6f11",
     "tag.StorageDirectory" : "/data/hdds/hdds",
     "tag.VolumeState" : "NORMAL",
     "tag.VolumeType" : "DATA_VOLUME",
     "tag.Hostname" : "0f71994a6169",
     "DbCompactLatencyNumOps" : 0,
     "DbCompactLatencyAvgTime" : 0.0,
     "TotalCapacity" : 49547334340,
     "Capacity" : 49497374720,
     "Available" : 49392513024,
     "Containers" : 1,
     "LayoutVersion" : 1,
     "Used" : 104861696,
     "Committed" : 968884224,
     "Reserved" : 49959620
   }
   ```
   
   After:
   
   ```
   {
     "name" : "Hadoop:service=HddsDatanode,name=VolumeInfoMetrics-/data/hdds",
     "modelerType" : "VolumeInfoMetrics-/data/hdds",
     "tag.Context" : "ozone",
     "tag.StorageType" : "DISK",
     "tag.DatanodeUuid" : "1bbe31d4-9dd9-4fcf-93aa-fd4717876414",
     "tag.VolumeState" : "NORMAL",
     "tag.VolumeType" : "DATA_VOLUME",
     "tag.StorageDirectory" : "/data/hdds/hdds",
     "tag.Hostname" : "f1c5efee2f91",
     "DbCompactLatencyNumOps" : 0,
     "DbCompactLatencyAvgTime" : 0.0,
     "Committed" : 968884224,
     "LayoutVersion" : 1,
     "Containers" : 1,
     "Capacity" : 499546271036,
     "Available" : 49390276608,
     "Used" : 104861696,
     "Reserved" : 49959620,
     "TotalCapacity" : 499596230656
   }
   ```
   


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