U4-6992 - fix server registration for new LB

src/Umbraco.Core/Sync/ServerRole.cs

@@ -0,0 +1,28 @@
+namespace Umbraco.Core.Sync
+{
+    /// <summary>
+    /// The role of a server in an application environment.
+    /// </summary>
+    public enum ServerRole : byte
+    {
+        /// <summary>
+        /// The server role is unknown.
+        /// </summary>
+        Unknown = 0,
+
+        /// <summary>
+        /// The server is the single server of a single-server environment.
+        /// </summary>
+        Single = 1,
+
+        /// <summary>
+        /// In a multi-servers environment, the server is a slave server.
+        /// </summary>
+        Slave = 2,
+
+        /// <summary>
+        /// In a multi-servers environment, the server is the master server.
+        /// </summary>
+        Master = 3
+    }
+}