merge: observability (register rows 33, 54, 56, 63, 66) — LocalDb backlog KPI history + sustained-threshold badge, honest stream-subscriber gauge rename + real data-connection gauges, central metrics port on the rig, ASPNETCORE_ENVIRONMENT on site containers, import-session rejection counter

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

@@ -443,12 +443,12 @@ public class SiteStreamGrpcServerTests : TestKit
     }
 
     [Fact]
-    public async Task SiteConnectionUpGauge_GoesToOneOnConnect_AndBackToZeroOnCancel()
+    public async Task SiteStreamSubscribersActiveGauge_GoesToOneOnConnect_AndBackToZeroOnCancel()
     {
-        // Telemetry follow-on: the scadabridge.site.connection.up gauge must read
+        // Telemetry follow-on: the scadabridge.site.stream.subscribers.active gauge must read
         // exactly 1 while a site stream is established and return to 0 once the
-        // stream terminates on the cancel path — proving SiteConnectionOpened() is
-        // matched by exactly one SiteConnectionClosed() in the handler's finally.
+        // stream terminates on the cancel path — proving SiteStreamSubscriberOpened() is
+        // matched by exactly one SiteStreamSubscriberClosed() in the handler's finally.
         var server = CreateServer();
         server.SetReady(Sys);
 
@@ -459,7 +459,7 @@ public class SiteStreamGrpcServerTests : TestKit
             listener.InstrumentPublished = (instrument, l) =>
             {
                 if (instrument.Meter.Name == ScadaBridgeTelemetry.MeterName &&
-                    instrument.Name == "scadabridge.site.connection.up")
+                    instrument.Name == "scadabridge.site.stream.subscribers.active")
                 {
                     l.EnableMeasurementEvents(instrument);
                 }
@@ -485,7 +485,7 @@ public class SiteStreamGrpcServerTests : TestKit
         // (possibly parallel) tests left behind — read relative so the assertion
         // is robust to test interleaving on the process-wide static counter.
         //
-        // SiteConnectionOpened() runs AFTER the _activeStreams insertion that
+        // SiteStreamSubscriberOpened() runs AFTER the _activeStreams insertion that
         // WaitForConditionAsync(ActiveStreamCount == 1) keys off (see
         // SiteStreamGrpcServer.SubscribeInstance), so a one-shot ReadGauge() here
         // can race the increment under full-suite CPU oversubscription. Poll the
@@ -499,7 +499,7 @@ public class SiteStreamGrpcServerTests : TestKit
         // After the cancel path runs the finally, the gauge is balanced back to
         // the baseline — no leaked "up" count. Poll here too: the gauge decrement
         // and the stream-count drop are independent observations, so under load
-        // give the finally's SiteConnectionClosed() time to land.
+        // give the finally's SiteStreamSubscriberClosed() time to land.
         AwaitAssert(() => Assert.Equal(baseline, ReadGauge()), TimeSpan.FromSeconds(5));
     }
 

tests/ZB.MOM.WW.ScadaBridge.Communication.Tests/SiteAlarmLiveCacheTelemetryTests.cs

@@ -7,7 +7,7 @@ namespace ZB.MOM.WW.ScadaBridge.Communication.Tests;
 /// Telemetry guards for the aggregated live alarm cache (plan #10, Task 6): the
 /// active-aggregator observable gauge reflects Started/Stopped, and the reconnect
 /// counter increments on each recorded reconnect. Mirrors the MeterListener read
-/// pattern used by <c>SiteStreamGrpcServerTests.SiteConnectionUpGauge_*</c>; reads are
+/// pattern used by <c>SiteStreamGrpcServerTests.SiteStreamSubscribersActiveGauge_*</c>; reads are
 /// relative to a baseline so the process-wide static instruments are robust to any
 /// parallel test interleaving.
 /// </summary>