diff --git a/src/ZB.MOM.WW.ScadaBridge.SiteRuntime/SiteRuntimeOptions.cs b/src/ZB.MOM.WW.ScadaBridge.SiteRuntime/SiteRuntimeOptions.cs
index fa86c445..967ad376 100644
--- a/src/ZB.MOM.WW.ScadaBridge.SiteRuntime/SiteRuntimeOptions.cs
+++ b/src/ZB.MOM.WW.ScadaBridge.SiteRuntime/SiteRuntimeOptions.cs
@@ -44,4 +44,16 @@ public class SiteRuntimeOptions
     /// Default: 8.
     /// </summary>
     public int ScriptExecutionThreadCount { get; set; } = 8;
+
+    /// <summary>
+    /// Max mirrored native alarms retained per source binding before older entries are dropped (logged).
+    /// Default: 1000.
+    /// </summary>
+    public int MirroredAlarmCapPerSource { get; set; } = 1000;
+
+    /// <summary>
+    /// Interval in milliseconds to retry a failed native alarm subscription.
+    /// Default: 5000ms.
+    /// </summary>
+    public int NativeAlarmRetryIntervalMs { get; set; } = 5000;
 }