From 0f924a0c84b5686e2c996c4aaa1266b98af510b9 Mon Sep 17 00:00:00 2001
From: James Newton-King <james@newtonking.com>
Date: Thu, 25 Jul 2024 10:08:29 +0800
Subject: [PATCH] Add test meter to stress app with meter and instrument tags
 (#5046)

---
 .../Stress/Stress.ApiService/Program.cs       | 11 +++++-
 .../Stress/Stress.ApiService/TestMetrics.cs   | 38 +++++++++++++++++++
 2 files changed, 48 insertions(+), 1 deletion(-)
 create mode 100644 playground/Stress/Stress.ApiService/TestMetrics.cs

diff --git a/playground/Stress/Stress.ApiService/Program.cs b/playground/Stress/Stress.ApiService/Program.cs
index 875f66f74a..b71038fce8 100644
--- a/playground/Stress/Stress.ApiService/Program.cs
+++ b/playground/Stress/Stress.ApiService/Program.cs
@@ -12,7 +12,9 @@
 builder.AddServiceDefaults();
 
 builder.Services.AddOpenTelemetry()
-    .WithTracing(tracing => tracing.AddSource(TraceCreator.ActivitySourceName, ProducerConsumer.ActivitySourceName));
+    .WithTracing(tracing => tracing.AddSource(TraceCreator.ActivitySourceName, ProducerConsumer.ActivitySourceName))
+    .WithMetrics(metrics => metrics.AddMeter(TestMetrics.MeterName));
+builder.Services.AddSingleton<TestMetrics>();
 
 var app = builder.Build();
 
@@ -20,6 +22,13 @@
 
 app.MapGet("/", () => "Hello world");
 
+app.MapGet("/increment-counter", (TestMetrics metrics) =>
+{
+    metrics.IncrementCounter(1, new TagList([new KeyValuePair<string, object?>("add-tag", "1")]));
+
+    return "Big trace created";
+});
+
 app.MapGet("/big-trace", async () =>
 {
     var bigTraceCreator = new TraceCreator();
diff --git a/playground/Stress/Stress.ApiService/TestMetrics.cs b/playground/Stress/Stress.ApiService/TestMetrics.cs
new file mode 100644
index 0000000000..5ab0b3681c
--- /dev/null
+++ b/playground/Stress/Stress.ApiService/TestMetrics.cs
@@ -0,0 +1,38 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Diagnostics;
+using System.Diagnostics.Metrics;
+
+namespace Stress.ApiService;
+
+public class TestMetrics : IDisposable
+{
+    public const string MeterName = "TestMeter";
+
+    private readonly Meter _meter;
+    private readonly Counter<int> _counter;
+
+    public TestMetrics()
+    {
+        _meter = new Meter(MeterName, "1.0.0", new[]
+        {
+            new KeyValuePair<string, object?>("meter-tag", Guid.NewGuid().ToString())
+        });
+
+        _counter = _meter.CreateCounter<int>("test-counter", unit: null, description: null, tags: new[]
+        {
+            new KeyValuePair<string, object?>("instrument-tag", Guid.NewGuid().ToString())
+        });
+    }
+
+    public void IncrementCounter(int value, in TagList tags)
+    {
+        _counter.Add(value, in tags);
+    }
+
+    public void Dispose()
+    {
+        _meter.Dispose();
+    }
+}