Hello, guys!
Some of my PMM2 graphs show nothing.
This is what my Disk Dashboard (Total Performance) looks like right now: https://imgur.com/yQGSWBp
Disk Latency, Avg Disks Operations Merge Ratio and Disk IO Size are empty.
BUT… if it’s a specific device (sda, as the following screenshot shows) everything is OK: https://imgur.com/YOtdHON
How do I fix those empty Total Performance disk graphs?
Hi Ruslan,
I have reproduced the issue. I will get back to you after an investigation.
The issue is related to NaN values provided by formulas for an idle disk.
Here is dashboard version with fixed formulas
https://github.com/percona/grafana-dashboards/raw/bd3da577215faaf54824585620b6ab1e9351c82f/dashboards/Disk_Details.json
Thank you, adivinho!