Fix arguments order for call of HeartbeatSlow

src/Servers/Kestrel/Core/src/Internal/Infrastructure/KestrelTrace.cs

@@ -47,8 +47,8 @@ internal class KestrelTrace : IKestrelTrace
         private static readonly Action<ILogger, Exception?> _notAllConnectionsAborted =
             LoggerMessage.Define(LogLevel.Debug, new EventId(21, "NotAllConnectionsAborted"), "Some connections failed to abort during server shutdown.");
 
-        private static readonly Action<ILogger, TimeSpan, TimeSpan, DateTimeOffset, Exception?> _heartbeatSlow =
-            LoggerMessage.Define<TimeSpan, TimeSpan, DateTimeOffset>(LogLevel.Warning, new EventId(22, "HeartbeatSlow"), @"As of ""{now}"", the heartbeat has been running for ""{heartbeatDuration}"" which is longer than ""{interval}"". This could be caused by thread pool starvation.");
+        private static readonly Action<ILogger, DateTimeOffset, TimeSpan, TimeSpan, Exception?> _heartbeatSlow =
+            LoggerMessage.Define<DateTimeOffset, TimeSpan, TimeSpan>(LogLevel.Warning, new EventId(22, "HeartbeatSlow"), @"As of ""{now}"", the heartbeat has been running for ""{heartbeatDuration}"" which is longer than ""{interval}"". This could be caused by thread pool starvation.");
 
         private static readonly Action<ILogger, string, Exception?> _applicationNeverCompleted =
             LoggerMessage.Define<string>(LogLevel.Critical, new EventId(23, "ApplicationNeverCompleted"), @"Connection id ""{ConnectionId}"" application never completed");
@@ -200,7 +200,7 @@ public virtual void NotAllConnectionsAborted()
 
         public virtual void HeartbeatSlow(TimeSpan heartbeatDuration, TimeSpan interval, DateTimeOffset now)
         {
-            _heartbeatSlow(_logger, heartbeatDuration, interval, now, null);
+            _heartbeatSlow(_logger, now, heartbeatDuration, interval, null);
         }
 
         public virtual void ApplicationNeverCompleted(string connectionId)

src/Servers/Kestrel/Core/test/HeartbeatTests.cs

@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.Globalization;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
@@ -22,15 +23,16 @@ public void HeartbeatIntervalIsOneSecond()
         }
 
         [Fact]
-        public async Task HeartbeatTakingLongerThanIntervalIsLoggedAsError()
+        public async Task HeartbeatTakingLongerThanIntervalIsLoggedAsWarning()
         {
             var systemClock = new MockSystemClock();
             var heartbeatHandler = new Mock<IHeartbeatHandler>();
             var debugger = new Mock<IDebugger>();
-            var kestrelTrace = new Mock<IKestrelTrace>();
+            var kestrelTrace = new TestKestrelTrace();
             var handlerMre = new ManualResetEventSlim();
             var handlerStartedTcs = new TaskCompletionSource(TaskCreationOptions.RunContinuationsAsynchronously);
             var now = systemClock.UtcNow;
+            var heartbeatDuration = TimeSpan.FromSeconds(2);
 
             heartbeatHandler.Setup(h => h.OnHeartbeat(now)).Callback(() =>
             {
@@ -41,7 +43,7 @@ public async Task HeartbeatTakingLongerThanIntervalIsLoggedAsError()
 
             Task blockedHeartbeatTask;
 
-            using (var heartbeat = new Heartbeat(new[] { heartbeatHandler.Object }, systemClock, debugger.Object, kestrelTrace.Object))
+            using (var heartbeat = new Heartbeat(new[] { heartbeatHandler.Object }, systemClock, debugger.Object, kestrelTrace))
             {
                 blockedHeartbeatTask = Task.Run(() => heartbeat.OnHeartbeat());
 
@@ -56,11 +58,16 @@ public async Task HeartbeatTakingLongerThanIntervalIsLoggedAsError()
             await blockedHeartbeatTask.DefaultTimeout();
 
             heartbeatHandler.Verify(h => h.OnHeartbeat(now), Times.Once());
-            kestrelTrace.Verify(t => t.HeartbeatSlow(TimeSpan.FromSeconds(2), Heartbeat.Interval, now), Times.Once());
+
+            var warningMessage = kestrelTrace.Logger.Messages.Single(message => message.LogLevel == LogLevel.Warning).Message;
+            Assert.Equal($"As of \"{now.ToString(CultureInfo.InvariantCulture)}\", the heartbeat has been running for "
+                + $"\"{heartbeatDuration.ToString("c", CultureInfo.InvariantCulture)}\" which is longer than "
+                + $"\"{Heartbeat.Interval.ToString("c", CultureInfo.InvariantCulture)}\". "
+                + "This could be caused by thread pool starvation.", warningMessage);
         }
 
         [Fact]
-        public async Task HeartbeatTakingLongerThanIntervalIsNotLoggedAsErrorIfDebuggerAttached()
+        public async Task HeartbeatTakingLongerThanIntervalIsNotLoggedIfDebuggerAttached()
         {
             var systemClock = new MockSystemClock();
             var heartbeatHandler = new Mock<IHeartbeatHandler>();