Multiple queries override preview windows

[davkal]

1. Edit a Flux panel
2. Add a second query
3. Run queries

Result: response preview panels override each other's values.

[andig]

I can confirm this.

[amotl]

Hi there,

I've tried to look into the things arriving within the onResponseReceived callback coming from hooking into ds-request-response and would like to report about my findings.

While I thought I might be able to deduce the position of the metrics query (A, B, ...) through looking at things like

const refId = this.$scope.ctrl.target.refId;
console.log('result:', {refId: refId, response: response, scope: this.$scope});
this.dataPreview = response.data;

it turns out it's not possible.

In fact, it looks like onResponseReceived is invoked four(!) times while I've expected just two invocations.

When investigating these objects, I found that the response data from refId: A vs. refId: B, it looks like they are not correlated to the metric queries A vs. B at all.

So, the behavior of populating this.dataPreview is not deterministic at all. The last response will be used, no matter what.

Hope this helps.

With kind regards,
Andreas.

[amotl]

Unsure, but grafana/grafana#20555 might be related to this.