Updating the data type from integer to decimal:

From Device Snapshot page:

• From the device snapshot page (Navigate to Inventory and click on a device to open the device snapshot page.), click on the 'Monitors' tab.
• Click on the 'Edit' icon under 'Actions' of a specific monitor.
• Select the data type as 'Decimal' by clicking on the radio button under 'Data type'.
• Click on 'Save' to update the data type details.

From Performance Monitors page: 

• Click on Settings → Monitoring → Performance Monitors.
• Select the required performance monitor to be updated from the list.
• In the 'Edit Monitor' tab, select the data type as 'Decimal' by clicking on the radio button under 'Data type'.
• Click on 'OK' to update the data type details.

From Device Templates page:

• Click on Settings → Configuration → Device Template.
• Select the required device template to be updated from the list.
• Under the 'Monitor' tab, click on the specific monitor to be modified.
• Select the data type as 'Decimal' by clicking on the radio button next to 'Data type'.
• Click on 'OK' to update the data type details.