fix(logs): flush Logger on UnhandledException that IsTerminating

CHANGELOG.md

@@ -5,6 +5,8 @@
 ### Fixes
 
 - Crontabs now support day names (MON-SUN) and allow step values and ranges to be combined ([#4407](https://github.com/getsentry/sentry-dotnet/pull/4407))
+- Experimental _Structured Logs_:
+  - Ensure all buffered logs are sent to Sentry when the application terminates unexpectedly. ([#4425](https://github.com/getsentry/sentry-dotnet/pull/4425))
 
 ### Dependencies
 

src/Sentry/Internal/Hub.cs

@@ -798,6 +798,7 @@ public async Task FlushAsync(TimeSpan timeout)
     {
         try
         {
+            Logger.Flush();
             await CurrentClient.FlushAsync(timeout).ConfigureAwait(false);
         }
         catch (Exception e)

test/Sentry.Tests/HubTests.cs

@@ -1624,6 +1624,31 @@ public void Logger_DisableAfterCreate_HasNoEffect()
         hub.Logger.Should().BeOfType<DefaultSentryStructuredLogger>();
     }
 
+    [Fact]
+    public async Task Logger_FlushAsync_DoesCaptureLog()
+    {
+        // Arrange
+        _fixture.Options.Experimental.EnableLogs = true;
+        var hub = _fixture.GetSut();
+
+        // Act
+        hub.Logger.LogWarning("Message");
+        await hub.FlushAsync();
+
+        // Assert
+        _fixture.Client.Received(1).CaptureEnvelope(
+            Arg.Is<Envelope>(envelope =>
+                envelope.Items.Single(item => item.Header["type"].Equals("log")).Payload.GetType().IsAssignableFrom(typeof(JsonSerializable))
+            )
+        );
+        await _fixture.Client.Received(1).FlushAsync(
+            Arg.Is<TimeSpan>(timeout =>
+                timeout.Equals(_fixture.Options.FlushTimeout)
+            )
+        );
+        hub.Logger.Should().BeOfType<DefaultSentryStructuredLogger>();
+    }
+
     [Fact]
     public void Logger_Dispose_DoesCaptureLog()
     {
@@ -1641,6 +1666,11 @@ public void Logger_Dispose_DoesCaptureLog()
                 envelope.Items.Single(item => item.Header["type"].Equals("log")).Payload.GetType().IsAssignableFrom(typeof(JsonSerializable))
             )
         );
+        _fixture.Client.Received(1).FlushAsync(
+            Arg.Is<TimeSpan>(timeout =>
+                timeout.Equals(_fixture.Options.ShutdownTimeout)
+            )
+        );
         hub.Logger.Should().BeOfType<DefaultSentryStructuredLogger>();
     }