Add load balancer (#453)

app/Enums/LoadBalancerMethod.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Enums;
+
+use App\Traits\Enum;
+
+final class LoadBalancerMethod
+{
+    use Enum;
+
+    const ROUND_ROBIN = 'round-robin';
+
+    const LEAST_CONNECTIONS = 'least-connections';
+
+    const IP_HASH = 'ip-hash';
+}