fix(communication)+fix(siteruntime): carry DetachedScriptThreads/ScriptRunShedCount/SiteStreamAlarmDropCount across the health wire; restore drained counters on failed send (arch-review 2026-08-19 P8-1)

tests/ZB.MOM.WW.ScadaBridge.Communication.Tests/Grpc/CentralControlDtoMapperTests.cs

@@ -554,6 +554,11 @@ public class CentralControlDtoMapperTests
             LocalDbReplicationConnected = true,
             LocalDbOplogBacklog = 250L,
             StartupReconcilerActive = true,
+            // arch-review 2026-08-19 P8-1: these three never crossed the wire at all
+            // (mapper omitted them entirely, always reading back as 0) until this fix.
+            DetachedScriptThreads = 2,
+            ScriptRunShedCount = 13,
+            SiteStreamAlarmDropCount = 41L,
         };
 
     /// <summary>
@@ -603,6 +608,9 @@ public class CentralControlDtoMapperTests
         Assert.Equal(expected.LocalDbReplicationConnected, actual.LocalDbReplicationConnected);
         Assert.Equal(expected.LocalDbOplogBacklog, actual.LocalDbOplogBacklog);
         Assert.Equal(expected.StartupReconcilerActive, actual.StartupReconcilerActive);
+        Assert.Equal(expected.DetachedScriptThreads, actual.DetachedScriptThreads);
+        Assert.Equal(expected.ScriptRunShedCount, actual.ScriptRunShedCount);
+        Assert.Equal(expected.SiteStreamAlarmDropCount, actual.SiteStreamAlarmDropCount);
     }
 
     /// <summary>

tests/ZB.MOM.WW.ScadaBridge.HealthMonitoring.Tests/HealthReportSenderTests.cs

@@ -333,6 +333,16 @@ public class HealthReportSenderTests
     /// un-sent report only, and the next successful report shipped with the
     /// counters at zero.
     /// </summary>
+    /// <remarks>
+    /// Extended for arch-review 2026-08-19 P8-1: <c>ScriptRunShedCount</c> is drained
+    /// by <c>CollectReport</c> the exact same way as the five counters above, but
+    /// <c>AddIntervalCounters</c> used to take only those five — a failed send
+    /// destructively lost the shed count forever. <c>DetachedScriptThreads</c> and
+    /// <c>SiteStreamAlarmDropCount</c> are deliberately NOT exercised here: they are
+    /// point-in-time gauges (set via <c>Interlocked.CompareExchange</c>/<c>Read</c>,
+    /// never zeroed by <c>CollectReport</c>), so a failed send loses nothing for them
+    /// to restore.
+    /// </remarks>
     [Fact]
     public async Task SendFailure_PreservesIntervalCountersForNextReport()
     {
@@ -341,7 +351,7 @@ public class HealthReportSenderTests
         collector.SetActiveNode(true);
         // Pre-populate every per-interval counter so the restore path on each
         // field is exercised — script error, alarm error, dead letter, site
-        // audit write failure, audit redaction failure.
+        // audit write failure, audit redaction failure, script run shed.
         collector.IncrementScriptError();
         collector.IncrementScriptError();
         collector.IncrementAlarmError();
@@ -351,6 +361,10 @@ public class HealthReportSenderTests
         collector.IncrementSiteAuditWriteFailures();
         collector.IncrementAuditRedactionFailure();
         collector.IncrementAuditRedactionFailure();
+        collector.IncrementScriptRunShed();
+        collector.IncrementScriptRunShed();
+        collector.IncrementScriptRunShed();
+        collector.IncrementScriptRunShed();
 
         var options = Options.Create(new HealthMonitoringOptions
         {
@@ -383,6 +397,7 @@ public class HealthReportSenderTests
         Assert.Equal(3, firstSuccess.DeadLetterCount);
         Assert.Equal(1, firstSuccess.SiteAuditWriteFailures);
         Assert.Equal(2, firstSuccess.AuditRedactionFailure);
+        Assert.Equal(4, firstSuccess.ScriptRunShedCount);
     }
 
     /// <summary>