Diagnostics: Adds DurationInMs to StoreResult (#4462)

* Add StoreResponseStatistics startTime to diagnostics

* Add latency in ms to make it easier to read.

* Converted to DurationInMs

* Remove start time

* Update baseline file.

---------

Co-authored-by: jakewilley_microsoft <--global>
Co-authored-by: Matias Quaranta <ealsur@users.noreply.github.com>

Author: j82w

Microsoft.Azure.Cosmos/src/Tracing/TraceWriter.TraceJsonWriter.cs

@@ -322,6 +322,17 @@ private void VisitStoreResponseStatistics(
                 this.jsonWriter.WriteFieldName("ResponseTimeUTC");
                 this.WriteDateTimeStringValue(storeResponseStatistics.RequestResponseTime);
 
+                this.jsonWriter.WriteFieldName("DurationInMs");
+                if (storeResponseStatistics.RequestStartTime.HasValue)
+                {
+                    TimeSpan latency = storeResponseStatistics.RequestResponseTime - storeResponseStatistics.RequestStartTime.Value;
+                    this.jsonWriter.WriteNumber64Value(latency.TotalMilliseconds);
+                }
+                else
+                {
+                    this.jsonWriter.WriteNullValue();
+                }
+
                 this.jsonWriter.WriteFieldName("ResourceType");
                 this.jsonWriter.WriteStringValue(storeResponseStatistics.RequestResourceType.ToString());
 

Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.Tests/BaselineTest/TestBaseline/TraceWriterBaselineTests.TraceData.xml

@@ -317,6 +317,7 @@
       "StoreResponseStatistics": [
         {
           "ResponseTimeUTC": "9999-12-31T23:59:59.9999999",
+          "DurationInMs": 315537897600000,
           "ResourceType": "Document",
           "OperationType": "Query",
           "RequestSessionToken": "42",
@@ -513,6 +514,7 @@
       "StoreResponseStatistics": [
         {
           "ResponseTimeUTC": "0001-01-01T00:00:00",
+          "DurationInMs": null,
           "ResourceType": "Database",
           "OperationType": "Create",
           "LocationEndpoint": null,