fix:完善meterProvider的访问权限

Author: billpyang

src/OpenTelemetryServiceProvider.php

@@ -68,9 +68,10 @@ public function register(): void
         // register custom meter
         $this->app->singleton(MeterInterface::class, function () {
             $resourceInfo = (new Sdk)->getResource();
-            Metric::$meterProvider = (new MeterProviderFactory)->create($resourceInfo);
+            $meterProvider = (new MeterProviderFactory)->create($resourceInfo);
+            Metric::setProvider($meterProvider);
 
-            return Metric::$meterProvider->getMeter(config('otel.meter_name', 'overtrue.laravel-open-telemetry'));
+            return $meterProvider->getMeter(config('otel.meter_name', 'overtrue.laravel-open-telemetry'));
         });
 
         $this->app->alias(MeterInterface::class, 'opentelemetry.meter');

src/Support/Metric.php

@@ -17,7 +17,7 @@ class Metric
 {
     private static ?bool $enabled = null;
 
-    public static ?MeterProviderInterface $meterProvider = null;
+    private static ?MeterProviderInterface $meterProvider = null;
 
     public function __construct(protected Application $app) {}
 
@@ -50,6 +50,16 @@ public function flush(): void
         self::$meterProvider?->forceFlush();
     }
 
+    public static function getProvider(): MeterProviderInterface
+    {
+        return self::$meterProvider;
+    }
+
+    public static function setProvider(MeterProviderInterface $meterProvider): void
+    {
+        self::$meterProvider = $meterProvider;
+    }
+
     // ======================= Core OpenTelemetry API =======================
 
     /**