Fix prometheus stats

Author: danog

src/API.php

@@ -51,7 +51,7 @@ final class API extends AbstractAPI
      *
      * @var string
      */
-    public const RELEASE = '8.4.7';
+    public const RELEASE = '8.4.8';
     /**
      * We're not logged in.
      *

src/Connection.php

@@ -559,6 +559,7 @@ public function sendMessage(MTProtoOutgoingMessage $message): void
         } elseif ($message->specialMethodType === SpecialMethodType::UNAUTHED_METHOD) {
             $this->uninitedPendingOutgoing->enqueue($message);
         } else {
+            $this->pendingOutgoingGauge?->inc();
             $this->mainPendingOutgoing->enqueue($message);
         }
         $this->flush();

src/MTProto/MTProtoOutgoingMessage.php

@@ -205,8 +205,7 @@ public function sent(): void
         }
         $this->state |= self::STATE_SENT;
         if (!$this instanceof Container) {
-            $this->next->prev = $this->prev;
-            $this->prev->next = $this->next;
+            $this->unlink();
         }
         $this->sent = hrtime(true);
         if ($this->contentRelated) {
@@ -221,6 +220,12 @@ public function sent(): void
             $sendDeferred->complete();
         }
     }
+    public function unlink(): void
+    {
+        $this->next->prev = $this->prev;
+        $this->prev->next = $this->next;
+        $this->connection->pendingOutgoingGauge?->dec();
+    }
     private function check(): void
     {
         if ($this->state & self::STATE_REPLIED) {

src/MTProtoSession/CallHandler.php

@@ -83,8 +83,7 @@ public function methodRecall(MTProtoOutgoingMessage $request, ?int $forceDatacen
             /** @var MTProtoOutgoingMessage */
             $request->setMsgId(null);
             $request->setSeqNo(null);
-            $request->next->prev = $request->prev;
-            $request->prev->next = $request->next;
+            $request->unlink();
         }
         if ($datacenter === $this->datacenter) {
             EventLoop::queue($this->sendMessage(...), $request);