Application Metrics table dashboard widgets cannot edit dimension columns

[trevorturk]

Environment

Sentry SaaS, Dashboards, Application Metrics dataset.

Summary

Application Metrics table widgets can render and can be edited if they already exist, but the widget builder does not allow changing the table dimension column after duplicating/editing a widget.

For example, I have an Application Metrics table widget with:

• Display type: Table
• Dataset: Application Metrics
• Columns:
  • context
  • sum(helloweather.internal)

The table renders correctly, showing rows grouped by context.

When I duplicate/edit the widget and try to change the dimension column from context to source, the first column editor shows None / None instead of a dimension selector. The rendered preview still shows CONTEXT, but there is no usable UI to change it to source.

Steps to reproduce

1. Create or open an Application Metrics dashboard table widget with a dimension column, e.g. context, and an aggregate, e.g. sum(helloweather.internal).
2. Duplicate the widget or edit it.
3. In the widget builder, look at the Columns section.
4. Try to change the dimension column from context to another metric attribute, e.g. source.

Expected behavior

The first column should be editable via a dimension/tag selector, allowing the user to change context to source, status, paid, etc.

Application Metrics table widgets should also be creatable from scratch if table rendering/querying is supported.

Actual behavior

The table preview renders the saved dimension correctly, but the editor shows None / None for the dimension row. There does not appear to be a way to change the dimension column through the UI.

Notes from source inspection

This looks like a frontend widget-builder issue:

• TraceMetricsConfig has table-query support via useTraceMetricsTableQuery, and tests cover DisplayType.TABLE with dataset: 'tracemetrics'.
• TraceMetricsConfig.supportedDisplayTypes omits DisplayType.TABLE, so new Application Metrics table widgets cannot be selected from scratch.
• In the Visualize step, WidgetType.TRACEMETRICS rows always render MetricSelectRow.
• MetricSelectRow appears designed for aggregate/function rows. Its onChange returns early unless field.kind === 'function'.
• For table dimension rows like context or source, the row is field.kind === 'field', so the metric selector shows None and cannot update the dimension.

A likely fix would be to render the normal field/column selector for non-function TRACEMETRICS table rows, and reserve MetricSelectRow for aggregate rows. If trace-metrics table widgets are supported by the backend, DisplayType.TABLE may also need to be added to TraceMetricsConfig.supportedDisplayTypes.

Screenshot

via https://helloweather.sentry.io/dashboard/5448468/?statsPeriod=1h

The image on the left was created by Seer and uses a Table, but I can't duplicate and edit it properly (can't change the grouping) and the image on the left is what I can make successfully (but isn't the preferred Table design)

[linear-code]

ENG-7705

[getsantry]

Assigning to @getsentry/support for routing ⏲️

[getsantry]

Routing to @getsentry/product-owners-dashboards for triage ⏲️

[bcoe]

@trevorturk I'm actually a bit surprised that the table widget is working at all for Application Metrics:

We had launched with the intention to add support for table components post-GA. Seems that we blocked this on the frontend but not the backend.

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We're keeping this open as a feature, with the intention that we'll add support for tables to the metric dataset in dashboards.