You can use Disk plugin to monitor the total nodes and free inodes.

You can use Auto detect or configure manually the partitions.

 
Output:

If you want to monitor specific inodes only you can use a script and a toolkit plugin.

Example Script that uses df -i command:

#!/bin/bash
echo "Filesystem,Inodes,Used,Free,Use%"
df -i | tail -n +2 | awk '{print $1 "," $2 "," $3 "," $4 "," $5}'

After creating the script in the server, you can use Toolkit sampler to integrate the newly created script.

Output:

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