ektravel commented on code in PR #14912:
URL: https://github.com/apache/druid/pull/14912#discussion_r1307605044
##########
docs/operations/metrics.md:
##########
@@ -427,6 +432,51 @@ These metrics are only available if the `SysMonitor`
module is included.
|`sys/storage/used`|Disk space used|`fsDirName`|Varies|
|`sys/cpu`|CPU used|`cpuName`, `cpuTime`|Varies|
+## OshiSysMonitor
+
+These metrics are only available if the `OshiSysMonitor` module is included.
+
+|Metric|Description|Dimensions|Normal Value|
+|------|-----------|----------|------------|
+|`sys/swap/free`|Free swap||Varies|
+|`sys/swap/max`|Max swap||Varies|
+|`sys/swap/pageIn`|Paged in swap||Varies|
+|`sys/swap/pageOut`|Paged out swap||Varies|
+|`sys/disk/write/count`|Writes to disk|`diskName`|Varies|
+|`sys/disk/read/count`|Reads from disk|`diskName`|Varies|
+|`sys/disk/write/size`|Bytes written to disk. One indicator of the amount of
paging occurring for segments.|`diskName`|Varies|
+|`sys/disk/read/size`|Bytes read from disk. One indicator of the amount of
paging occurring for segments.|`diskName`|Varies|
+|`sys/disk/queue`|Disk queue length. Measures number of requests waiting to be
processed by Disk|`diskName`|Generally 0|
+|`sys/disk/transferTime`|Transfer time to read from or write to
disk|`diskName`|Depends on hardware|
+|`sys/net/write/size`|Bytes written to the network|`netName`, `netAddress`,
`netHwaddr`|Varies|
+|`sys/net/read/size`|Bytes read from the network|`netName`, `netAddress`,
`netHwaddr`|Varies|
+|`sys/net/read/packets`|Total packets read from the network|`netName`,
`netAddress`, `netHwaddr`|Varies|
+|`sys/net/write/packets`|Total packets written to the network|`netName`,
`netAddress`, `netHwaddr`|Varies|
+|`sys/net/read/errors`|Total network read errors|`netName`, `netAddress`,
`netHwaddr`|Generally 0|
+|`sys/net/write/errors`|Total network write errors|`netName`, `netAddress`,
`netHwaddr`|Generally 0|
+|`sys/net/read/dropped`|Total packets dropped coming from network|`netName`,
`netAddress`, `netHwaddr`|Generally 0|
+|`sys/net/write/collisions`|Total network write collisions|`netName`,
`netAddress`, `netHwaddr`|Generally 0|
+|`sys/fs/used`|Filesystem bytes used |`fsDevName`, `fsDirName`|< max|
+|`sys/fs/max`|Filesystem bytes max |`fsDevName`, `fsDirName`|Varies|
+|`sys/fs/files/count`|Filesystem total IO Nodes |`fsDevName`, `fsDirName`|<
max|
+|`sys/fs/files/free`|Filesystem free IO nodes|`fsDevName`, `fsDirName`| Varies
|
+|`sys/mem/used`|Memory used||< max|
+|`sys/mem/max`|Memory max||Varies|
+|`sys/mem/free`|Memory free||Varies|
+|`sys/storage/used`|Disk space used|`fsDirName`|Varies|
+|`sys/cpu`|CPU used|`cpuName`, `cpuTime`|Varies|
+|`sys/uptime`|Total system uptime||Varies|
+|`sys/la/{i}`|System CPU Load averages over past i minutes, where
i={1,5,15}||Varies|
+|`sys/tcpv4/activeOpens`|Total TCP active open connections||Varies|
+|`sys/tcpv4/passiveOpens`|Total TCP passive open connections||Varies|
+|`sys/tcpv4/attemptFails`|Total TCP active connection failures||Generally 0|
+|`sys/tcpv4/estabResets`|Total TCP connection resets||Generally 0|
+|`sys/tcpv4/in/segs`|Total segments received in connection||Varies|
+|`sys/tcpv4/in/errs`|Errors while reading segments||Generally 0|
+|`sys/tcpv4/out/segs`|Total segments sent||Varies|
+|`sys/tcpv4/out/rsts`|Total "out reset" packets sent to reset the
connection||Generally 0|
+|`sys/tcpv4/retrans/segs`|Total segments re-transmitted||Varies but not to
high|
Review Comment:
```suggestion
|`sys/tcpv4/retrans/segs`|Total segments re-transmitted||Varies|
```
If we cannot provide a range, it's best to keep the description minimal.
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