diff --git a/test/Microsoft.TestPlatform.PerformanceTests/TranslationLayer/EventHandler/DiscoveryEventHandler.cs b/test/Microsoft.TestPlatform.PerformanceTests/TranslationLayer/EventHandler/DiscoveryEventHandler.cs
index 4505ffb9e0..bc609dc574 100644
--- a/test/Microsoft.TestPlatform.PerformanceTests/TranslationLayer/EventHandler/DiscoveryEventHandler.cs
+++ b/test/Microsoft.TestPlatform.PerformanceTests/TranslationLayer/EventHandler/DiscoveryEventHandler.cs
@@ -15,17 +15,12 @@ public class DiscoveryEventHandler2 : ITestDiscoveryEventsHandler2
     /// <summary>
     /// Gets the discovered test cases.
     /// </summary>
-    public List<TestCase> DiscoveredTestCases { get; }
+    public List<TestCase> DiscoveredTestCases { get; } = new List<TestCase>();
 
     /// <summary>
     /// Gets the metrics.
     /// </summary>
-    public IDictionary<string, object>? Metrics { get; private set; }
-
-    public DiscoveryEventHandler2()
-    {
-        DiscoveredTestCases = new List<TestCase>();
-    }
+    public IDictionary<string, object> Metrics { get; private set; } = new Dictionary<string, object>();
 
     public void HandleRawMessage(string rawMessage)
     {
diff --git a/test/Microsoft.TestPlatform.PerformanceTests/TranslationLayer/EventHandler/RunEventHandler.cs b/test/Microsoft.TestPlatform.PerformanceTests/TranslationLayer/EventHandler/RunEventHandler.cs
index b21d945c73..eea50855d0 100644
--- a/test/Microsoft.TestPlatform.PerformanceTests/TranslationLayer/EventHandler/RunEventHandler.cs
+++ b/test/Microsoft.TestPlatform.PerformanceTests/TranslationLayer/EventHandler/RunEventHandler.cs
@@ -20,7 +20,7 @@ public class RunEventHandler : ITestRunEventsHandler2
     /// <summary>
     /// Gets the metrics.
     /// </summary>
-    public IDictionary<string, object>? Metrics { get; private set; }
+    public IDictionary<string, object> Metrics { get; private set; } = new Dictionary<string, object>();
 
     /// <summary>
     /// Gets the log message.
diff --git a/test/Microsoft.TestPlatform.PerformanceTests/TranslationLayer/TelemetryPerfTestBase.cs b/test/Microsoft.TestPlatform.PerformanceTests/TranslationLayer/TelemetryPerfTestBase.cs
index 6283bfb0e8..90a3be7182 100644
--- a/test/Microsoft.TestPlatform.PerformanceTests/TranslationLayer/TelemetryPerfTestBase.cs
+++ b/test/Microsoft.TestPlatform.PerformanceTests/TranslationLayer/TelemetryPerfTestBase.cs
@@ -34,9 +34,9 @@ public TelemetryPerfTestBase()
     /// </summary>
     /// <param name="handlerMetrics"></param>
     /// <param name="scenario"></param>
-    public void PostTelemetry(IDictionary<string, object> handlerMetrics, PerfAnalyzer perfAnalyzer, string projectName, [CallerMemberName] string scenario = null)
+    public void PostTelemetry(IDictionary<string, object> handlerMetrics, PerfAnalyzer perfAnalyzer, string projectName, [CallerMemberName] string? scenario = null)
     {
-        var properties = new Dictionary<string, string>
+        var properties = new Dictionary<string, string?>
         {
             ["Version"] = "1.0.1",
             ["Project"] = projectName,