[ZBXNEXT-8388] Include normalized value along with raw values in SMART data attributes

[glesys-andreas]

The raw value from smartctl is not always accurate, and defined by the manufacturer, by exposing the normalizedValue we can build templates and triggers for example wear_level.

For example: In our setup with many Samsung SSDs, we can read the wear level from attribute id 177 from the smartdata, but the raw value in this case is far from the same as the normalized value.

          "id": 177,
          "name": "Wear_Leveling_Count",
          "raw": {
            "string": "8308",
            "value": 8308
          },
          "thresh": 5,
          "value": 56,
          "when_failed": "",
          "worst": 56

Reference: https://support.zabbix.com/browse/ZBXNEXT-8388

[vdovinmih]

UP. Is any body interested in normalized values ?

[Silureth]

UP. Yes please!!!

[serisman]

UP. Is any body interested in normalized values ?

Yes please! It would be very helpful in monitoring the health of SSDs over time.

The specific normalized value mentioned above is the inverse of what we already have for NVMe SSDs with the 'percentage_used' attribute. So, being able get something similar for SATA SSDs (that support it) would be helpful in leveling the playing field.