fix(notifier): stabilize storm breaker cooldown and summary tests

src/Notifier/StellaOps.Notifier/StellaOps.Notifier.Tests/StormBreaker/StormBreakerTests.cs

@@ -3,7 +3,6 @@ using Microsoft.Extensions.Options;
 using Microsoft.Extensions.Time.Testing;
 using StellaOps.Notifier.Worker.StormBreaker;
 
-#if false
 namespace StellaOps.Notifier.Tests.StormBreaker;
 
 public class InMemoryStormBreakerTests
@@ -36,9 +35,10 @@ public class InMemoryStormBreakerTests
     {
         // Act
         var result = await _stormBreaker.EvaluateAsync("tenant1", "key1", "event1");
+        var state = await _stormBreaker.GetStateAsync("tenant1", "key1");
 
         // Assert
-        Assert.False(result.IsStorm);
+        Assert.False(result.IsStorm, $"action={result.Action}, threshold={result.Threshold}, count={result.EventCount}, stateActive={state?.IsActive}");
         Assert.Equal(StormAction.SendNormally, result.Action);
         Assert.Equal(1, result.EventCount);
     }
@@ -89,8 +89,10 @@ public class InMemoryStormBreakerTests
             await _stormBreaker.EvaluateAsync("tenant1", "key1", $"event{i}");
         }
 
-        // Advance time past summary interval
+        // Keep the storm active (within cooldown), then cross summary interval.
-        _timeProvider.Advance(TimeSpan.FromMinutes(16));
+        _timeProvider.Advance(TimeSpan.FromMinutes(9));
+        await _stormBreaker.EvaluateAsync("tenant1", "key1", "event_before_summary");
+        _timeProvider.Advance(TimeSpan.FromMinutes(7));
 
         // Act
         var result = await _stormBreaker.EvaluateAsync("tenant1", "key1", "event_after_interval");
@@ -325,4 +327,3 @@ public class InMemoryStormBreakerTests
         Assert.False(infoResult.IsStorm);
     }
 }
-#endif

src/Notifier/StellaOps.Notifier/StellaOps.Notifier.Worker/StormBreaker/IStormBreaker.cs

@@ -254,7 +254,7 @@ public sealed class StormState
     /// <summary>
     /// Whether the storm is currently active.
     /// </summary>
-    public bool IsActive { get; set; } = true;
+    public bool IsActive { get; set; }
 
     /// <summary>
     /// Sample event metadata for summary generation.
@@ -433,7 +433,18 @@ public sealed class InMemoryStormBreaker : IStormBreaker
         var state = _storms.AddOrUpdate(
             key,
             _ => CreateNewState(tenantId, stormKey, eventId, now),
-            (_, existing) => UpdateState(existing, eventId, now, window));
+            (_, existing) =>
+            {
+                if (existing.IsActive && now - existing.LastActivityAt > _options.StormCooldown)
+                {
+                    _logger.LogInformation(
+                        "Storm ended for key {StormKey} tenant {TenantId}. Total events: {TotalEvents}, Suppressed: {Suppressed}",
+                        stormKey, tenantId, existing.EventIds.Count, existing.SuppressedCount);
+                    return CreateNewState(tenantId, stormKey, eventId, now);
+                }
+
+                return UpdateState(existing, eventId, now, window);
+            });
 
         // Clean old events outside the window
         var cutoff = now - window;
@@ -441,15 +452,6 @@ public sealed class InMemoryStormBreaker : IStormBreaker
 
         var eventCount = state.EventTimestamps.Count;
 
-        // Check if storm should end (cooldown elapsed)
-        if (state.IsActive && now - state.LastActivityAt > _options.StormCooldown)
-        {
-            state.IsActive = false;
-            _logger.LogInformation(
-                "Storm ended for key {StormKey} tenant {TenantId}. Total events: {TotalEvents}, Suppressed: {Suppressed}",
-                stormKey, tenantId, state.EventIds.Count, state.SuppressedCount);
-        }
-
         // Not in storm and below threshold
         if (!state.IsActive && eventCount < threshold)
         {