feat(audit): M5.2 per-node stuck-count KPIs (T6) — repo per-node aggregation, actor message pair, CentralUI tiles

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Pages/Monitoring/Health.razor

@@ -9,6 +9,7 @@
 @using ZB.MOM.WW.ScadaBridge.HealthMonitoring
 @using ZB.MOM.WW.ScadaBridge.Commons.Messages.Notification
 @using ZB.MOM.WW.ScadaBridge.Commons.Messages.Audit
+@using ZB.MOM.WW.ScadaBridge.Commons.Types.Audit
 @using ZB.MOM.WW.ScadaBridge.Communication
 @implements IDisposable
 @inject ICentralHealthAggregator HealthAggregator
@@ -65,7 +66,9 @@
        (buffered / stuck / parked). Refreshed alongside the site states. *@
     <SiteCallKpiTiles Snapshot="@_siteCallKpi"
                       IsAvailable="@_siteCallKpiAvailable"
-                      ErrorMessage="@_siteCallKpiError" />
+                      ErrorMessage="@_siteCallKpiError"
+                      PerNodeSnapshots="@_siteCallNodeKpis"
+                      PerNodeAvailable="@_siteCallNodeKpiAvailable" />
 
     @* Audit Log (#23) M7 Bundle E — three KPI tiles for the Audit channel
        (volume / error rate / backlog). Refreshed alongside the site states. *@
@@ -378,6 +381,12 @@
     private bool _siteCallKpiAvailable;
     private string? _siteCallKpiError;
 
+    // Per-node Site Call KPI breakdown (T6: M5.2 per-node stuck-count KPIs).
+    // Passed to SiteCallKpiTiles as an optional sub-table.
+    private IReadOnlyList<SiteCallNodeKpiSnapshot> _siteCallNodeKpis =
+        Array.Empty<SiteCallNodeKpiSnapshot>();
+    private bool _siteCallNodeKpiAvailable;
+
     private static bool SiteHasActiveErrors(SiteHealthState state)
     {
         var report = state.LatestReport;
@@ -415,7 +424,7 @@
     {
         _siteStates = HealthAggregator.GetAllSiteStates();
         await LoadOutboxKpis();
-        await LoadSiteCallKpis();
+        await Task.WhenAll(LoadSiteCallKpis(), LoadSiteCallNodeKpis());
         await LoadAuditKpis();
     }
 
@@ -474,6 +483,30 @@
         }
     }
 
+    // Per-node site-call KPI loader (T6: M5.2). Best-effort; a fault silently
+    // suppresses the per-node sub-table rather than degrading the dashboard.
+    private async Task LoadSiteCallNodeKpis()
+    {
+        try
+        {
+            var response = await CommunicationService.GetPerNodeSiteCallKpisAsync(
+                new PerNodeSiteCallKpiRequest(Guid.NewGuid().ToString("N")));
+            if (response.Success)
+            {
+                _siteCallNodeKpis = response.Nodes;
+                _siteCallNodeKpiAvailable = true;
+            }
+            else
+            {
+                _siteCallNodeKpiAvailable = false;
+            }
+        }
+        catch
+        {
+            _siteCallNodeKpiAvailable = false;
+        }
+    }
+
     // Tiles show the numeric KPI when available, or an em dash when the outbox
     // KPI query failed — matching how the page renders other unavailable data.
     private string OutboxTileValue(int value) =>