feat(prometheus-direct-charting): slice 3 — remove grafana + config rewrite + changelog

Remove the entire Grafana surface: integrations/grafana.py, GrafanaWidgetSource
(+ _fetch_chart, now redundant since prometheus chart exists), GrafanaLinkWidget,
LinksTab, get_grafana_status endpoint, useGrafanaStatus hook, GrafanaStatus type,
fetchGrafanaStatus client fn, registry/nav/tab entries (FE+BE). Rewrite
config.yaml thin-dashboard rule to match reality (recharts is sanctioned for
Prometheus-backed series). CHANGELOG migration note added.

Backend: 293 pytest pass, ruff clean. Frontend: build+lint green (0 errors).
SC-115/116 grep-clean (only prometheus_range.py migration comments + Dashboard.test
shortcut fixture remain — both spec-allowed).

frontend/src/integrations/__tests__/navEntries.test.ts

@@ -21,13 +21,9 @@ describe("navEntries", () => {
 
 	it("returns all observability entries", () => {
 		const entries = configuredNavEntries(
-			new Set(["alertmanager", "grafana", "prometheus"]),
+			new Set(["alertmanager", "prometheus"]),
 		);
-		expect(entries.map((e) => e.label)).toEqual([
-			"Alertmanager",
-			"Grafana",
-			"Prometheus",
-		]);
+		expect(entries.map((e) => e.label)).toEqual(["Alertmanager", "Prometheus"]);
 	});
 
 	it("returns Backups + Authentik when configured", () => {

frontend/src/integrations/navEntries.ts

@@ -10,7 +10,6 @@ import {
 	Activity,
 	DatabaseBackup,
 	GanttChartSquare,
-	Link2,
 	Monitor,
 	Server,
 	Users,
@@ -49,12 +48,6 @@ export const SERVICE_TYPE_NAV_ENTRIES: NavEntry[] = [
 		icon: Activity,
 		path: "/services/alertmanager",
 	},
-	{
-		serviceType: "grafana",
-		label: "Grafana",
-		icon: Link2,
-		path: "/services/grafana",
-	},
 	{
 		serviceType: "prometheus",
 		label: "Prometheus",

frontend/src/integrations/registry.test.ts

@@ -12,7 +12,6 @@ describe("service registry", () => {
 	it("registers the backend service types", () => {
 		expect(Object.keys(SERVICE_REGISTRY).sort()).toEqual([
 			"alertmanager",
-			"grafana",
 			"jellyfin",
 			"nextcloud",
 			"prometheus",
@@ -21,9 +20,6 @@ describe("service registry", () => {
 	});
 
 	it("binds widget kinds per service", () => {
-		expect(SERVICE_REGISTRY.grafana.widgets.map((w) => w.kind)).toEqual([
-			"link",
-		]);
 		expect(SERVICE_REGISTRY.prometheus.widgets.map((w) => w.kind)).toEqual([
 			"metric",
 			"chart",
@@ -43,12 +39,12 @@ describe("service registry", () => {
 		expect(Object.keys(BUILTIN_WIDGETS).sort()).toEqual(["backups", "static"]);
 	});
 
-	it("resolves a service-bound widget via the services list", () => {
+	it("resolves a prometheus metric widget via the services list", () => {
 		const widget: WidgetInstance = {
 			id: "w1",
 			service_id: "s1",
-			widget_kind: "link",
-			title: "Dashboard",
+			widget_kind: "metric",
+			title: "Metric",
 			config: {},
 			enabled: true,
 			sort_order: 0,
@@ -58,9 +54,9 @@ describe("service registry", () => {
 		const services: ServiceInstance[] = [
 			{
 				id: "s1",
-				service_type: "grafana",
-				name: "Grafana",
-				config: { base_url: "https://grafana.example.com" },
+				service_type: "prometheus",
+				name: "Prometheus",
+				config: { base_url: "https://prometheus.example.com" },
 				secrets_set: { api_key: true },
 				enabled: true,
 				created_at: 0,
@@ -69,7 +65,7 @@ describe("service registry", () => {
 		];
 		const resolved = resolveWidget(widget, services);
 		expect(resolved).toBeDefined();
-		expect(resolved?.refreshIntervalMs).toBe(0);
+		expect(resolved?.refreshIntervalMs).toBe(30_000);
 	});
 
 	it("resolves an alertmanager active_alerts widget", () => {

frontend/src/integrations/registry.ts

@@ -1,7 +1,6 @@
 import type { ComponentType } from "react";
 import { AlertmanagerAlertsWidget } from "../widgets/AlertmanagerAlertsWidget";
 import { BackupsWidget } from "../widgets/BackupsWidget";
-import { GrafanaLinkWidget } from "../widgets/GrafanaLinkWidget";
 import { PrometheusChartWidget } from "../widgets/PrometheusChartWidget";
 import { PrometheusGaugeWidget } from "../widgets/PrometheusGaugeWidget";
 import { PrometheusMeanWidget } from "../widgets/PrometheusMeanWidget";
@@ -69,29 +68,6 @@ export const SERVICE_REGISTRY: Record<string, ServiceBinding> = {
 			},
 		],
 	},
-	grafana: {
-		serviceType: "grafana",
-		name: "Grafana",
-		description: "Dashboards, metrics, and logs.",
-		widgets: [
-			{
-				kind: "link",
-				name: "Dashboard link",
-				description: "Deep-link to a Grafana dashboard or panel.",
-				refreshIntervalMs: 0,
-				defaultConfig: { dashboard_uid: "" },
-				configSchema: {
-					type: "object",
-					properties: {
-						dashboard_uid: { type: "string" },
-						panel_id: { type: "integer" },
-					},
-					required: ["dashboard_uid"],
-				},
-				component: GrafanaLinkWidget,
-			},
-		],
-	},
 	prometheus: {
 		serviceType: "prometheus",
 		name: "Prometheus",