# Spec delta: Fix Vinograd WAN dashboard annotations

## ADDED Requirements

### Requirement: Vinograd WAN dashboard opens without datasource errors

The Vinograd WAN dashboard (`/d/vinograd-wan/vinograd-wan`) MUST open and render
all panels WITHOUT the error "Datasource __grafana__ was not found".

- The dashboard JSON MUST NOT reference the built-in `__grafana__` datasource in
  its `annotations.list` (it is not registered in this Grafana's database).
- `annotations.list` MUST be empty (`[]`), matching the working
  `garage-cluster.json` dashboard.

#### Scenario: Dashboard renders without datasource error

- **WHEN** a user opens `https://grafana.nixg.ru/d/vinograd-wan/vinograd-wan`
- **THEN** the dashboard loads without the error "Datasource __grafana__ was not found"
- **AND** all panels render metric data from Prometheus (`uid: Prometheus`)

#### Scenario: Dashboard file stores no __grafana__ reference

- **WHEN** the file `grafana/dashboards/vinograd-wan.json` is parsed
- **THEN** `annotations.list` is `[]` OR contains no item whose
  `datasource.uid` equals `__grafana__`

## Context

- The `__grafana__` datasource (built-in annotations/alerts) is not present in
  Grafana 11 OSS `data_source` table (only Prometheus and Loki are).
- Panels reference `uid: Prometheus` and are unaffected.