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@@ -87,3 +87,42 @@ RPC operations.
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| `GetSmallFile` | Get small file operations |
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| `CloseContainer` | Close container operations |
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+### Key Space Metrics
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+
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+The metrics for various key space manager operations in HDFS Ozone.
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+
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+key space manager (KSM) is a service that similar to the Namenode in HDFS.
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+In the current design of KSM, it maintains metadata of all volumes, buckets and keys.
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+These metrics are only available when ozone is enabled.
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+
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+Following is the set of counters maintained for each key space operation.
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+
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+*Total number of operation* - We maintain an array which counts how
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+many times a specific operation has been performed.
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+Eg.`NumVolumeCreate` tells us how many times create volume has been
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+invoked in KSM.
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+
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+*Total number of failed operation* - This type operation is opposite to the above
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+operation.
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+Eg.`NumVolumeCreateFails` tells us how many times create volume has been invoked
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+failed in KSM.
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+
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+Following are the counters for each of key space operations.
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+
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+| Name | Description |
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+|:---- |:---- |
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+| `VolumeCreate` | Create volume operation |
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+| `VolumeUpdates` | Update volume property operation |
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+| `VolumeInfos` | Get volume information operation |
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+| `VolumeCheckAccesses` | Check volume access operation |
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+| `VolumeDeletes` | Delete volume operation |
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+| `VolumeLists` | List volume operation |
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+| `BucketCreates` | Create bucket operation |
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+| `BucketInfos` | Get bucket information operation |
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+| `BucketUpdates` | Update bucket property operation |
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+| `BucketDeletes` | Delete bucket operation |
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+| `BucketLists` | List bucket operation |
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+| `KeyAllocate` | Allocate key operation |
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+| `KeyLookup` | Look up key operation |
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+| `KeyDeletes` | Delete key operation |
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+| `KeyLists` | List key operation |
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Yiqun Lin