Canvas can't override Field not found

Grafana Zabbix
1

Hello Community members
I have a Problem with my Grafana Dashboard, more Precisely with my Canvas inside the Dashboard.
Some infos about the Dashboard:
I’m using Zabbix as backend and Grafana as frontend.
The Canvas works in combination with a variable, wich holds al wanted hosts, so i can give a repeat command for the Canvas and get my created Canvas for every server in the variable.
I habe querys from A to E, so 5 querys, in that canvas
A: Is the Agent reachable
B: Storage of C:
C: Storage of D:
D: Storage of I:
E: uninstalled windows updates
Some server have only C:, some have C:\ and D:, some have all three.

I wanted to create a variable managed canvas that shows different stuff depending on what storage is found an other options.

msedge_51NGB79UaW
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My Problem ist as you can see in the picture above, that everything i can get is, “Field not found” for every query that does not has current data for the specified host.
I actually cant even see a table for the missing data or pick the query as an option, as you can see here.
image
There should be 5 querys as an option.
Also the picked query is marked as not found and will disappear if something else gets picked.

The Value mapping already has a rule for missing data but it just gets ignored.
image

How can i override the “Field not found” entry?

Thanks in advance for your answers

3

In Prometheus,
just need to add “OR on() vector(0)” to the end of expression like this,

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4

I don’t use Canvas, but I tried to simulate the problem.

The devil is in the detail. How to identify it correctly. The system volumes have a different name. And you can solve this problem if you use a regular expression in the Overrides.

I used /\(C:\): Used space/ and I have no problem.

Open the canvas and select Override in the upper right corner. In the next step, select the + Add override field button and select the field : field with the name matching the regex.
Now you can use the me regex: /\(C:\): Used space/and click the + Add Override property button and select the Standard Option > Show Name field. And enter some custom name in the new field. For example, I’ll type “C: used”.

image
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For more information about regexes, see the Zabbix and Grafana plugin documentation

As for the renaming problem, I have not been able to solve it, I would even believe that it is a property and cannot be edited

5

Definitely not the cleanest solution (because it has to be done again after every installation of Grafana update), but it is possible to alter this text in canvasPanel.xxxx.js file located in public/build folder:

canvasPanel