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admission-control

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Use when the user asks to "write a validator", "add validation", "implement admission control", "write a mutating webhook", "add a mutation handler", "validate incoming resources", "implement admission logic", "add admission webhooks", "write ingress validation", or asks how to validate or mutate resources before they are persisted in a grafana-app-sdk app. Provides guidance on implementing validation and mutation admission handlers for grafana-app-sdk apps.

skills/grafana-app-sdk/admission-control/SKILL.md

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Nov 9, 2026
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# Admission Control

Admission control intercepts resource create/update requests before they are persisted. In grafana-app-sdk there are two types:

- **Validation** — accept or reject a request; cannot modify the resource
- **Mutation** — modify the resource before it is persisted (e.g. set defaults, normalize fields)

The app business logic for admission is identical whether the app runs as a standalone operator or inside `grafana/apps`. The only difference is the runtime: standalone apps stand up their own webhook server; `grafana/apps` apps have admission auto-registered as a Kubernetes plugin.

## Getting Stubs

For standalone apps, if `pkg/app/app.go` does not yet exist, a stub App can be generated with:

```bash
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