Rahul

From one of customer logs, There seems to be an issue with Rest sensor plugin. We don't expect sensor name to be missing. `{"level":"warn","Poller":"SCES1P000","plugin":"Rest:Sensor","object":"Sensor","key":"SNES1P012.","caller":"sensor/sensor.go:102","time":"2022-10-19T10:37:11+02:00","message":"missing instance key"} {"level":"warn","Poller":"SCES1P000","plugin":"Rest:Sensor","object":"Sensor","key":"SNES1P007.","caller":"sensor/sensor.go:102","time":"2022-10-19T10:37:11+02:00","message":"missing instance key"} {"level":"warn","Poller":"SCES1P000","plugin":"Rest:Sensor","object":"Sensor","key":"SNES1P008.","caller":"sensor/sensor.go:102","time":"2022-10-19T10:37:11+02:00","message":"missing...

Currently we have many duplicate go files like metric_float32.go, metric_float64.go and so on. They should be combined using go1.18+ generics.

`visits` counter in the workload detail template is neither used for calculating performance metrics nor is it exported. It can be removed to enhance the performance of workload detail metrics...

Rest/Zapi parity for volume_labels

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**Zapi Response** volume_labels{aggr="aggr0", cluster="umeng-aff300-01-02", datacenter="u2", instance="dc-1:12992", isEncrypted="false", isHardwareEncrypted="false", is_sis_volume="false", job="harvest", node="umeng-aff300-01", node_root="true", root_volume="Yes", snapshot_autodelete="true", state="online", style="flexvol", svm="umeng-aff300-01", type="rw", volume="vol0"} 1 **Rest response** volume_labels{aggr="aggr0", cluster="umeng-aff300-01-02", datacenter="u2", , instance="dc-1:12992", isEncrypted="false", isHardwareEncrypted="true", is_sis_volume="false",...

Thanks @faguayot for raising [here](https://github.com/NetApp/harvest/issues/2315#issuecomment-2010191616)

Thanks Hubert for raising. [Discord](https://discord.com/channels/855068651522490400/1209529853200699483)

RestPerf Flexcache Performance metrics

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Jira: ONTAPPM-104093 #2428