perf(dcl): batch subscribe/read/write seam, bounded reconnect, sharded subscriptions

src/ZB.MOM.WW.ScadaBridge.Commons/Types/DataConnections/OpcUaEndpointConfig.cs

@@ -66,6 +66,14 @@ public sealed class OpcUaEndpointConfig
     /// Display name for the subscription.
     /// </summary>
     public string SubscriptionDisplayName { get; set; } = "ScadaBridge";
+    /// <summary>
+    /// Maximum monitored items placed on a single OPC UA subscription before the
+    /// adapter shards onto an additional subscription. Item-count ceilings are a
+    /// property of the target server, so this is per endpoint rather than global.
+    /// A site sized at 37,500 tags shards into 8 subscriptions at the default.
+    /// Values &lt;= 0 are treated as the default.
+    /// </summary>
+    public int MaxMonitoredItemsPerSubscription { get; set; } = 5000;
 
     // Read / filter
     /// <summary>