Provide sample instructions on setting up prometheus via prometheus-operator and then configuring a sample rule to monitor the volume space utilization, and once available space is less than 10%, it will start firing the alert.
```
100 * kubelet_volume_stats_available_bytes{job="kubelet"}
/
kubelet_volume_stats_capacity_bytes{job="kubelet"}
< 10
```
Signed-off-by: Pawan <pawan@mayadata.io>
