[Metrics Advisor] test failing in nightly runs

[v-yilinhu]

Metrics Advisor nightly test runs are failing with:

Error Message
Azure.RequestFailedException : Service request failed.
Status: 400 (Bad Request)

Content:
{"code":"BadRequest","message":""}

Headers:
X-Request-ID: 4f5804dc-ac45-4a4d-8e86-cb6cbe613fb3
x-envoy-upstream-service-time: 273
apim-request-id: 4f5804dc-ac45-4a4d-8e86-cb6cbe613fb3
Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
X-Content-Type-Options: nosniff
Date: Fri, 11 Jun 2021 19:03:45 GMT
Content-Length: 34
Content-Type: application/json; charset=utf-8

Stack Trace
at Azure.AI.MetricsAdvisor.MicrosoftAzureMetricsAdvisorRestAPIOpenAPIV2RestClient.CreateMetricFeedback(MetricFeedback body, CancellationToken cancellationToken) in //sdk/metricsadvisor/Azure.AI.MetricsAdvisor/src/Generated/MicrosoftAzureMetricsAdvisorRestAPIOpenAPIV2RestClient.cs:line 2239
at Azure.AI.MetricsAdvisor.MetricsAdvisorClient.AddFeedback(MetricFeedback feedback, CancellationToken cancellationToken) in //sdk/metricsadvisor/Azure.AI.MetricsAdvisor/src/MetricsAdvisorClient.cs:line 726
--- End of stack trace from previous location where exception was thrown ---
at Azure.Core.TestFramework.DiagnosticScopeValidatingInterceptor.<>c__DisplayClass4_01.<<WrapAsyncResultCore>g__Await|0>d.MoveNext() in /mnt/vss/_work/1/s/sdk/core/Azure.Core.TestFramework/src/Instrumentation/DiagnosticScopeValidatingInterceptor.cs:line 91 --- End of stack trace from previous location where exception was thrown --- at System.Threading.Tasks.ValueTask1.get_Result()
at Azure.Core.TestFramework.DiagnosticScopeValidatingInterceptor.<>c__DisplayClass5_01.<<ValidateDiagnosticScopeInterceptor>b__0>d.MoveNext() in /mnt/vss/_work/1/s/sdk/core/Azure.Core.TestFramework/src/Instrumentation/DiagnosticScopeValidatingInterceptor.cs:line 142 --- End of stack trace from previous location where exception was thrown --- at System.Threading.Tasks.ValueTask1.get_Result()
at Azure.Core.TestFramework.DiagnosticScopeValidatingInterceptor.ValidateDiagnosticScope[T](Func1 action, MethodInfo methodInfo, String source) in /mnt/vss/_work/1/s/sdk/core/Azure.Core.TestFramework/src/Instrumentation/DiagnosticScopeValidatingInterceptor.cs:line 165 at Azure.AI.MetricsAdvisor.Tests.MetricFeedbackLiveTests.AddAndGetAnomalyFeedbackWithMinimumSetup(Boolean useTokenCredential) in /mnt/vss/_work/1/s/sdk/metricsadvisor/Azure.AI.MetricsAdvisor/tests/MetricsAdvisorClient/MetricFeedbackLiveTests.cs:line 41 at NUnit.Framework.Internal.TaskAwaitAdapter.GenericAdapter1.GetResult()
at NUnit.Framework.Internal.AsyncToSyncAdapter.Await(Func`1 invoke)
at NUnit.Framework.Internal.Commands.TestMethodCommand.RunTestMethod(TestExecutionContext context)
at NUnit.Framework.Internal.Commands.TestMethodCommand.Execute(TestExecutionContext context)
at NUnit.Framework.Internal.Commands.BeforeAndAfterTestCommand.<>c__DisplayClass1_0.b__0()
at NUnit.Framework.Internal.Commands.BeforeAndAfterTestCommand.RunTestMethodInThreadAbortSafeZone(TestExecutionContext context, Action action)

For more details check here:

• https://dev.azure.com/azure-sdk/internal/_build/results?buildId=943936&view=results
• https://dev.azure.com/azure-sdk/internal/_build/results?buildId=944091&view=results