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)

src/ZB.MOM.WW.ScadaBridge.HealthMonitoring/CentralHealthReportLoop.cs

@@ -132,7 +132,8 @@ public class CentralHealthReportLoop : BackgroundService
                         alarmErrors: report.AlarmEvaluationErrorCount,
                         deadLetters: report.DeadLetterCount,
                         siteAuditWriteFailures: report.SiteAuditWriteFailures,
-                        auditRedactionFailures: report.AuditRedactionFailure);
+                        auditRedactionFailures: report.AuditRedactionFailure,
+                        scriptRunShedCount: report.ScriptRunShedCount);
                     throw;
                 }
 

src/ZB.MOM.WW.ScadaBridge.HealthMonitoring/HealthReportSender.cs

@@ -182,7 +182,8 @@ public class HealthReportSender : BackgroundService
                         alarmErrors: report.AlarmEvaluationErrorCount,
                         deadLetters: report.DeadLetterCount,
                         siteAuditWriteFailures: report.SiteAuditWriteFailures,
-                        auditRedactionFailures: report.AuditRedactionFailure);
+                        auditRedactionFailures: report.AuditRedactionFailure,
+                        scriptRunShedCount: report.ScriptRunShedCount);
                     throw;
                 }
 

src/ZB.MOM.WW.ScadaBridge.HealthMonitoring/ISiteHealthCollector.cs

@@ -286,12 +286,19 @@ public interface ISiteHealthCollector
     /// <param name="deadLetters">Dead letter count to add back.</param>
     /// <param name="siteAuditWriteFailures">Site audit write failure count to add back.</param>
     /// <param name="auditRedactionFailures">Audit redaction failure count to add back.</param>
+    /// <param name="scriptRunShedCount">
+    /// Interval-drained script/alarm run-shed count to add back (arch-review 2026-08-19
+    /// P8-1). Additive trailing parameter defaulting to 0 so existing callers keep
+    /// compiling; <c>DetachedScriptThreads</c>/<c>SiteStreamAlarmDropCount</c> are
+    /// point-in-time gauges, not drained on collect, so they need no restore path.
+    /// </param>
     void AddIntervalCounters(
         int scriptErrors,
         int alarmErrors,
         int deadLetters,
         int siteAuditWriteFailures,
-        int auditRedactionFailures)
+        int auditRedactionFailures,
+        int scriptRunShedCount = 0)
     {
         // Default no-op so test fakes do not need to be updated. The real
         // SiteHealthCollector overrides this with the Interlocked.Add restore.

src/ZB.MOM.WW.ScadaBridge.HealthMonitoring/SiteHealthCollector.cs

@@ -245,19 +245,25 @@ public class SiteHealthCollector : ISiteHealthCollector
         int alarmErrors,
         int deadLetters,
         int siteAuditWriteFailures,
-        int auditRedactionFailures)
+        int auditRedactionFailures,
+        int scriptRunShedCount = 0)
     {
         // Each counter is restored atomically via
         // Interlocked.Add so an increment that arrived during the failed Send
         // (and therefore accumulated against the zero left by CollectReport's
         // Exchange) is correctly summed with the values being put back. No
-        // ordering between the five Adds is required — they target independent
-        // fields.
+        // ordering between the six Adds is required — they target independent
+        // fields. scriptRunShedCount joins this restore path (arch-review
+        // 2026-08-19 P8-1) because it is drained by CollectReport the same way
+        // as the other five; DetachedScriptThreads and SiteStreamAlarmDropCount
+        // are point-in-time gauges (CompareExchange/Read, never zeroed on
+        // collect) so a failed Send loses nothing for them to restore.
         if (scriptErrors != 0) Interlocked.Add(ref _scriptErrorCount, scriptErrors);
         if (alarmErrors != 0) Interlocked.Add(ref _alarmErrorCount, alarmErrors);
         if (deadLetters != 0) Interlocked.Add(ref _deadLetterCount, deadLetters);
         if (siteAuditWriteFailures != 0) Interlocked.Add(ref _siteAuditWriteFailures, siteAuditWriteFailures);
         if (auditRedactionFailures != 0) Interlocked.Add(ref _auditRedactionFailures, auditRedactionFailures);
+        if (scriptRunShedCount != 0) Interlocked.Add(ref _scriptRunShedCount, scriptRunShedCount);
     }
 
     /// <inheritdoc />