#2777 Fix for - MonitoredItem2.OnReportEvent Ignores Session in ISyst…

…emContext During Notification Process (#2779)

Check the Session included in the ISystemContext instance, if any, and compare it with those belonging to the monitored items.
If the ISystemContext instance contains a Session, the event will be appended only to the monitored items belonging to the same Session.
If the ISystemContext instance does not contain a Session, the event will be appended to all monitored items, regardless of their sessions.

Libraries/Opc.Ua.Server/Diagnostics/MonitoredNode.cs

@@ -1,5 +1,5 @@
 /* ========================================================================
- * Copyright (c) 2005-2020 The OPC Foundation, Inc. All rights reserved.
+ * Copyright (c) 2005-2024 The OPC Foundation, Inc. All rights reserved.
  *
  * OPC Foundation MIT License 1.00
  * 
@@ -253,7 +253,22 @@ public void OnReportEvent(ISystemContext context, NodeState node, IFilterTarget
                 lock (NodeManager.Lock)
                 {
                     // enqueue event
-                    monitoredItem?.QueueEvent(e);
+                    if (context?.SessionId != null && monitoredItem?.Session?.Id?.Identifier != null)
+                    {
+                        if (monitoredItem.Session.Id.Identifier.Equals(context.SessionId.Identifier))
+                        {
+                            monitoredItem?.QueueEvent(e);
+                        }
+                        else
+                        {
+                            continue;
+                        }
+                    }
+                    else
+                    {
+                        monitoredItem?.QueueEvent(e);
+                    }
+
                 }
             }
         }