ECSatize AlertsSystem (#5559)

Content.Shared/Alert/AlertSyncEvent.cs

@@ -0,0 +1,16 @@
+using Robust.Shared.GameObjects;
+
+namespace Content.Shared.Alert;
+
+/// <summary>
+///     Raised when the AlertSystem needs alert sources to recalculate their alert states and set them.
+/// </summary>
+public class AlertSyncEvent : EntityEventArgs
+{
+    public EntityUid Euid { get; }
+
+    public AlertSyncEvent(EntityUid euid)
+    {
+        Euid = euid;
+    }
+}