fix: fix queue depth metrics on timeout

Author: Tolsee

caddy/caddy_test.go

@@ -1023,7 +1023,7 @@ func TestMaxWaitTimeWorker(t *testing.T) {
 
 	expectedMetrics := `
 	# TYPE frankenphp_worker_queue_depth gauge
-	frankenphp_worker_queue_depth{worker="service"} 9
+	frankenphp_worker_queue_depth{worker="service"} 0
 	`
 
 	ctx := caddy.ActiveContext()

worker.go

@@ -225,7 +225,7 @@ func (worker *worker) handleRequest(fc *frankenPHPContext) {
 		case scaleChan <- fc:
 			// the request has triggered scaling, continue to wait for a thread
 		case <-timeoutChan(maxWaitTime):
-			// metrics.DequeuedWorkerRequest(worker.name)
+			metrics.DequeuedWorkerRequest(worker.name)
 			// the request has timed out stalling
 			fc.reject(504, "Gateway Timeout")
 			return