Chart from streaming datasets with multiple subjects are displayed incorrectly

[Anonymous]

If you try to display a streaming dataset as a chart and the dataset has multiple subjects, the amount of data points displayed is divided by the amount of subjects that is contained in the dataset.

Effectively the chart is cut in half in the middle so only displays half as many values and the values are displayed on the right half of the chart only.

Example:

Dataset:

[
{
  "timestamp": "2020-03-10T12:21:34.123Z",
  "subject": "Subject1",
  "value": 123
},
{
  "timestamp": "2020-03-10T12:21:44.789Z",
  "subject": "Subject2",
  "value": 123
}
]

Chart (using danish labels):

Akse: timestamp

Forklaring (subject in danish): subject

Værdi: value

How the chart looks:

[v-qiuyu-msft]

Hi @Anonymous, 

In my opinion, it's expected. When we create a dashboard tile based on a streaming dataset, we can set Time window to display no more than Last 60 minutes. So the time vale is enough. 

Best Regards,
Qiuyun Yu

[Anonymous]

HI @v-qiuyu-msft 

Sorry for taking a while to get back to you. Maybe I am not explaining properly.

When you have one set of data. The chart is displayed correctly.Working chart, 1 dataset

However, if there is multiple subjects in the same dataset, the chart is broken.

Broken chart with multiple datasets

Are you saying that I should expect Power BI not to be able to render full charts and not keep data points in sync on the x-axis?

That can't be right. The charts are clearly bugged for multiple subjects in a single dataset.

Edit: Here is an example chart that is rendered using Node-RED. I expect the Power BI dashboard chart to render like this.

* See how the lines match up?

* See how the entire chart is filled?

Chart rendered correctly by Node-RED

\Anders/

[Anonymous]

Almost two years later, this is still completely broken.

How to report this bug to MS and get this looked at?