grafana/metrics-drilldown

Fix: remove heatmap transformation no data work around

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#1,123 opened on Mar 9, 2026

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good first issue

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Description

What is this?

Remove the heatmap panel transformation to filter empty heatmap data frame responses, substituting an empty frame with no fields.

When can we do this?

When Prometheus returns an empty frame with no fields, compliant with the data plane no data contract. When this issue is closed https://github.com/grafana/grafana-prometheus-datasource/issues/115

Contributor guide

Research direction
Wait for the linked Prometheus datasource issue to be resolved, then remove the heatmap transformation workaround and verify that an empty frame with no fields is handled correctly.
Tech stack
typescript
Domain
backendapi
Issue type
Refactor
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Blocked
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
TypeScriptGrafana data framesPrometheus
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50