feat: add Metrics page, remove app bar badge, fix sidebar label

- Add src/api/metrics.ts: Prometheus text parser + fetchGpuPluginMetrics()
  fetching from Intel GPU device plugin pods (port 9090). Extracts engine
  utilization (active/total ticks → %), boost frequency (MHz), VRAM and
  system memory usage, cumulative energy (µJ).

- Add src/components/MetricsPage.tsx: per-card metrics display with inline
  utilization bars, graceful fallback when enableMonitoring is not set.

- Register Metrics sidebar entry (mdi:chart-line) and route /intel-gpu/metrics.

- Remove registerAppBarAction and AppBarGpuBadge (colored info bubble).

- Fix sidebar parent label: 'Intel GPU' → 'intel-gpu'.

- Bump to v0.2.0; update artifacthub-pkg.yml with new archive URL and checksum.

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

artifacthub-pkg.yml

@@ -1,4 +1,4 @@
-version: "0.1.0"
+version: "0.2.0"
 name: headlamp-intel-gpu-plugin
 displayName: Intel GPU
 description: >-
@@ -7,13 +7,15 @@ description: >-
   allocation, pods requesting Intel GPU resources, and injects Intel GPU
   sections into native Node and Pod detail pages. Supports discrete (i915),
   Xe, and integrated GPU nodes with graceful degradation when the device
-  plugin operator is not installed.
+  plugin operator is not installed. Includes a Metrics page showing real-time
+  engine utilization, GPU frequency, VRAM usage, and energy from the device
+  plugin's Prometheus endpoint.
 createdAt: "2026-02-18T00:00:00Z"
 license: Apache-2.0
 category: monitoring-logging
 
 homeURL: https://github.com/privilegedescalation/headlamp-intel-gpu-plugin
-appVersion: "0.1.0"
+appVersion: "0.2.0"
 
 keywords:
   - headlamp
@@ -43,6 +45,12 @@ links:
     url: https://intel.github.io/intel-device-plugins-for-kubernetes/
 
 changes:
+  - kind: added
+    description: "Metrics page: real-time engine utilization, boost frequency, VRAM usage, and energy from Intel GPU device plugin Prometheus endpoint (port 9090)"
+  - kind: changed
+    description: "Sidebar label changed to intel-gpu"
+  - kind: removed
+    description: "Removed app bar health badge"
   - kind: added
     description: "Overview dashboard: plugin health, GPU node summary, allocation bar, active GPU pods"
   - kind: added
@@ -61,7 +69,7 @@ changes:
     description: "App bar health badge: hidden when no Intel GPU plugin detected"
 
 annotations:
-  headlamp/plugin/archive-url: "https://github.com/privilegedescalation/headlamp-intel-gpu-plugin/releases/download/v0.1.0/headlamp-intel-gpu-plugin-0.1.0.tar.gz"
-  headlamp/plugin/archive-checksum: "sha256:d6a50567d0f9e537f0edadac334d6a03cd182f5b64b47264577f2213fd882687"
+  headlamp/plugin/archive-url: "https://github.com/privilegedescalation/headlamp-intel-gpu-plugin/releases/download/v0.2.0/headlamp-intel-gpu-plugin-0.2.0.tar.gz"
+  headlamp/plugin/archive-checksum: "sha256:404be582bd13c167f61785028eb6eb91dd621106cbe76038f2c071a576a1a442"
   headlamp/plugin/version-compat: ">=0.20.0"
   headlamp/plugin/distro-compat: "in-cluster,web,app"