fix : failureStatus (#21175)

* fix : failureStatus

use HealthCheckRegistration.FailureStatus when CheckHealthAsync failure

Fixes https://github.com/dotnet/aspnetcore/issues/22503

src/HealthChecks/HealthChecks/src/DefaultHealthCheckService.cs

@@ -121,7 +121,7 @@ namespace Microsoft.Extensions.Diagnostics.HealthChecks
                 {
                     var duration = stopwatch.GetElapsedTime();
                     entry = new HealthReportEntry(
-                        status: HealthStatus.Unhealthy,
+                        status: registration.FailureStatus,
                         description: "A timeout occurred while running check.",
                         duration: duration,
                         exception: ex,
@@ -136,7 +136,7 @@ namespace Microsoft.Extensions.Diagnostics.HealthChecks
                 {
                     var duration = stopwatch.GetElapsedTime();
                     entry = new HealthReportEntry(
-                        status: HealthStatus.Unhealthy,
+                        status: registration.FailureStatus,
                         description: ex.Message,
                         duration: duration,
                         exception: ex,

src/HealthChecks/HealthChecks/test/DefaultHealthCheckServiceTest.cs

@@ -531,6 +531,40 @@ namespace Microsoft.Extensions.Diagnostics.HealthChecks
             Assert.False(hangs);
         }
         
+        [Fact]
+        public async Task CheckHealthAsync_WithFailureStatus()
+        {
+            // Arrange
+            var service = CreateHealthChecksService(b =>
+            {
+                b.AddCheck<FailCapturingCheck>("degraded", HealthStatus.Degraded);
+                b.AddCheck<FailCapturingCheck>("healthy", HealthStatus.Healthy);
+                b.AddCheck<FailCapturingCheck>("unhealthy", HealthStatus.Unhealthy);
+            });
+
+            // Act
+            var results = await service.CheckHealthAsync();
+
+            // Assert
+            Assert.Collection(
+                results.Entries,
+                actual =>
+                {
+                    Assert.Equal("degraded", actual.Key);
+                    Assert.Equal(HealthStatus.Degraded, actual.Value.Status);
+                },
+                actual =>
+                {
+                    Assert.Equal("healthy", actual.Key);
+                    Assert.Equal(HealthStatus.Healthy, actual.Value.Status);
+                },
+                actual =>
+                {
+                    Assert.Equal("unhealthy", actual.Key);
+                    Assert.Equal(HealthStatus.Unhealthy, actual.Value.Status);
+                });
+        }
+
         private static DefaultHealthCheckService CreateHealthChecksService(Action<IHealthChecksBuilder> configure)
         {
             var services = new ServiceCollection();
@@ -571,5 +605,13 @@ namespace Microsoft.Extensions.Diagnostics.HealthChecks
                 return Task.FromResult(HealthCheckResult.Healthy(data: data));
             }
         }
+        
+        private class FailCapturingCheck : IHealthCheck
+        {
+            public Task<HealthCheckResult> CheckHealthAsync(HealthCheckContext context, CancellationToken cancellationToken = default)
+            {
+                throw new Exception("check failed");
+            }
+        }
     }
 }