feat(kpi): K8 — AuditLog sample source

src/ZB.MOM.WW.ScadaBridge.AuditLog/ServiceCollectionExtensions.cs

@@ -7,10 +7,12 @@ using ZB.MOM.WW.Audit;
 using ZB.MOM.WW.Configuration;
 using ZB.MOM.WW.ScadaBridge.AuditLog.Central;
 using ZB.MOM.WW.ScadaBridge.AuditLog.Configuration;
+using ZB.MOM.WW.ScadaBridge.AuditLog.Kpi;
 using ZB.MOM.WW.ScadaBridge.AuditLog.Payload;
 using ZB.MOM.WW.ScadaBridge.AuditLog.Redaction;
 using ZB.MOM.WW.ScadaBridge.AuditLog.Site;
 using ZB.MOM.WW.ScadaBridge.AuditLog.Site.Telemetry;
+using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Kpi;
 using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Services;
 using IAuditWriter = ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Services.IAuditWriter;
 
@@ -234,6 +236,18 @@ public static class ServiceCollectionExtensions
             // provider as a singleton on both site and central paths.
             sp.GetRequiredService<INodeIdentityProvider>()));
 
+        // M6 (K8) KPI History & Trends: the AuditLog source the central KPI
+        // recorder enumerates each sampling pass to snapshot Global-scope Audit
+        // Log KPIs (volume / error rate / backlog) into the KpiSample history
+        // table. Scoped to match its IAuditLogRepository dependency — a SCOPED
+        // EF Core service; the recorder opens a fresh scope per sampling pass.
+        // TryAdd-Enumerable so multiple sources can register the same interface
+        // (NotificationOutbox + SiteCallAudit + SiteHealth add their own) without
+        // any one composition root clobbering another, and re-registration is a
+        // no-op if AddAuditLog were ever called twice.
+        services.TryAddEnumerable(
+            ServiceDescriptor.Scoped<IKpiSampleSource, AuditLogKpiSampleSource>());
+
         return services;
     }