worker(alarms): synthetic GUID + degraded/source_provider on emitted transitions

src/ZB.MOM.WW.MxGateway.Worker/MxAccess/MxAccessEventMapper.cs

@@ -124,6 +124,15 @@ public sealed class MxAccessEventMapper
     /// <param name="category">Alarm taxonomy bucket from the Galaxy template.</param>
     /// <param name="description">Human-readable alarm description.</param>
     /// <param name="statuses">Array of MxStatusProxy values from MXAccess.</param>
+    /// <param name="degraded">
+    ///     <see langword="true"/> when this transition was synthesized by the
+    ///     subtag-provider fallback rather than the native alarmmgr path.
+    ///     Defaults to <see langword="false"/> to preserve alarmmgr parity.
+    /// </param>
+    /// <param name="sourceProvider">
+    ///     The alarm provider that sourced this transition. Defaults to
+    ///     <see cref="AlarmProviderMode.Alarmmgr"/> for the native path.
+    /// </param>
     public MxEvent CreateOnAlarmTransition(
         string sessionId,
         string alarmFullReference,
@@ -137,7 +146,9 @@ public sealed class MxAccessEventMapper
         string operatorComment,
         string category,
         string description,
-        Array? statuses)
+        Array? statuses,
+        bool degraded = false,
+        AlarmProviderMode sourceProvider = AlarmProviderMode.Alarmmgr)
     {
         MxEvent mxEvent = CreateBaseEvent(
             MxEventFamily.OnAlarmTransition,
@@ -159,6 +170,8 @@ public sealed class MxAccessEventMapper
             OperatorComment = operatorComment ?? string.Empty,
             Category = category ?? string.Empty,
             Description = description ?? string.Empty,
+            Degraded = degraded,
+            SourceProvider = sourceProvider,
         };
         if (originalRaiseTimestampUtc is { } orts)
         {