[AzureMonitorExporter] update test and readme (Azure#37021)

* update test and readme

* meter provider

Author: Timothy Mothra

sdk/monitor/Azure.Monitor.OpenTelemetry.AspNetCore/tests/Azure.Monitor.OpenTelemetry.AspNetCore.Integration.Tests/DistroWebAppLiveTests.cs

@@ -13,7 +13,9 @@
 using Microsoft.Extensions.Logging;
 using NUnit.Framework;
 using OpenTelemetry.Logs;
+using OpenTelemetry.Metrics;
 using OpenTelemetry.Resources;
+using OpenTelemetry.Trace;
 
 #if NET6_0_OR_GREATER
 namespace Azure.Monitor.OpenTelemetry.AspNetCore.Integration.Tests
@@ -89,11 +91,13 @@ public async Task VerifyDistro()
             Assert.True(res.Equals("Response from Test Server"), "If this assert fails, the in-process test server is not running.");
 
             // SHUTDOWN
+            var tracerProvider = app.Services.GetRequiredService<TracerProvider>();
+            tracerProvider.ForceFlush();
+            tracerProvider.Shutdown();
 
-            // NOTE: If this test starts failing, Flushing may be necessary.
-            //var tracerProvider = app.Services.GetRequiredService<TracerProvider>();
-            //tracerProvider.ForceFlush();
-            //tracerProvider.Shutdown();
+            var meterProvider = app.Services.GetRequiredService<MeterProvider>();
+            meterProvider.ForceFlush();
+            meterProvider.Shutdown();
 
             await app.StopAsync(); // shutdown to prevent collecting the log queries.
 

sdk/monitor/Azure.Monitor.OpenTelemetry.AspNetCore/tests/Azure.Monitor.OpenTelemetry.AspNetCore.Integration.Tests/README.md

@@ -17,7 +17,7 @@ To run these tests locally you must first create your test resources.
 2. Then run the New-TestResources cmd which will create the required test resources.
 
     ```powershell
-    eng\common\TestResources\New-TestResources.ps1 -ServiceDirectory monitor
+    eng\common\TestResources\New-TestResources.ps1 -ServiceDirectory monitor -SubscriptionId 'YOUR SUBSCRIPTION ID' -ResourceGroupName 'YOUR RESOURCE GROUP NAME'
     ```
 
     If this script fails, it should instruct you to install any missing dependencies.