[增添]添加了Prometheus服务、对应的widget展示（待美化）

management-panel/app/Filament/Widgets/PrometheusMetrics.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Filament\Widgets;
+
+use App\Services\PrometheusService;
+use Filament\Widgets\Widget;
+
+class PrometheusMetrics extends Widget
+{
+    protected static string $view = 'filament.widgets.prometheus-metrics';
+
+    protected function getViewData(): array
+    {
+        $prometheus = new PrometheusService();
+
+        $currentMemoryUsage = $prometheus->query('(1 - (node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes)) * 100');
+        $memoryUsageRange = $prometheus->queryRange(
+            '(1 - (avg_over_time(node_memory_MemAvailable_bytes[1h]) / avg_over_time(node_memory_MemTotal_bytes[1h]))) * 100',
+            now()->subHour()->timestamp,
+            now()->timestamp,
+            60
+        );
+
+        return [
+            'currentMemoryUsage' => $currentMemoryUsage,
+            'memoryUsageRange' => $memoryUsageRange,
+        ];
+    }
+}