'SpringBoot 2.x + Jubilee: Disk space metrics to Grafana

Small question regarding SpringBoot 2.6.x + Jubilee, and the new disk space metrics provided.

Out of the box, the new metrics available with Spring 2.6 are: disk_free_bytes anddisk_total_bytes

Therefore, what I tried, I went to Grafana and create this dashboard:

As you can see, there is a small issue with the axis.

What is the issue, of not seeing something more meaning full such as 8G 1.4M etc.

I was hoping to create a visual which looks like this.

What am I doing wrong so that I only get the two lines that are rather flat?

Thank you.

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