refactor(historian): gate before translate (no discarded alloc on secondary) + strengthen double-write warning (review)

tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/Historian/HistorianAdapterActorTests.cs

@@ -29,12 +29,11 @@ public sealed class HistorianAdapterActorTests : RuntimeActorTestBase
     /// <summary>Thread-safe fake sink that records every <see cref="EnqueueAsync"/> call.</summary>
     private sealed class RecordingSink : IAlarmHistorianSink
     {
-        private int _count;
         private readonly object _lock = new();
         private readonly List<AlarmHistorianEvent> _events = new();
 
         /// <summary>The number of <see cref="EnqueueAsync"/> calls observed so far.</summary>
-        public int EnqueueCount => Volatile.Read(ref _count);
+        public int EnqueueCount { get { lock (_lock) { return _events.Count; } } }
 
         /// <summary>A snapshot of every event enqueued so far (in arrival order).</summary>
         public IReadOnlyList<AlarmHistorianEvent> Events
@@ -50,7 +49,6 @@ public sealed class HistorianAdapterActorTests : RuntimeActorTestBase
                 _events.Add(evt);
             }
 
-            Interlocked.Increment(ref _count);
             return Task.CompletedTask;
         }