fix:octane模式下导出metric

Author: billpyang

src/Facades/Metric.php

@@ -14,6 +14,7 @@
  * @method static \OpenTelemetry\API\Metrics\HistogramInterface histogram(string $name, ?string $unit = null, ?string $description = null, array $advisories = [])
  * @method static \OpenTelemetry\API\Metrics\GaugeInterface gauge(string $name, ?string $unit = null, ?string $description = null, array $advisories = [])
  * @method static \OpenTelemetry\API\Metrics\ObservableGaugeInterface observableGauge(string $name, ?string $unit = null, ?string $description = null, array|callable $advisories = [], callable ...$callbacks)
+ * @method static void flush()
  *
  * @see \Overtrue\LaravelOpenTelemetry\Support\Metric
  */

src/Handlers/RequestTerminatedHandler.php

@@ -6,6 +6,7 @@
 
 use Laravel\Octane\Events\RequestTerminated;
 use Overtrue\LaravelOpenTelemetry\Facades\Measure;
+use Overtrue\LaravelOpenTelemetry\Facades\Metric;
 
 class RequestTerminatedHandler
 {
@@ -16,5 +17,6 @@ public function handle(RequestTerminated $event): void
     {
         // In Octane mode, we need to force flush the tracer provider.
         Measure::flush();
+        Metric::flush();
     }
 }

src/Support/Metric.php

@@ -4,6 +4,7 @@
 
 use Illuminate\Contracts\Foundation\Application;
 use Illuminate\Support\Facades\Log;
+use OpenTelemetry\API\Globals;
 use OpenTelemetry\API\Metrics\CounterInterface;
 use OpenTelemetry\API\Metrics\GaugeInterface;
 use OpenTelemetry\API\Metrics\HistogramInterface;
@@ -39,6 +40,14 @@ public function isEnabled(): bool
         return self::$enabled;
     }
 
+    /**
+     * Force flush (for Octane mode)
+     */
+    public function flush(): void
+    {
+        Globals::meterProvider()?->forceFlush();
+    }
+
     // ======================= Core OpenTelemetry API =======================
 
     /**