Update telemetry benchmark

bench/BenchmarkDotNet.Artifacts/results/Polly.Core.Benchmarks.TelemetryBenchmark-report-github.md

@@ -1,17 +1,17 @@
 ``` ini
 
-BenchmarkDotNet=v0.13.5, OS=Windows 11 (10.0.22621.1702/22H2/2022Update/SunValley2)
-Intel Core i9-10885H CPU 2.40GHz, 1 CPU, 16 logical and 8 physical cores
-.NET SDK=7.0.203
-  [Host] : .NET 7.0.5 (7.0.523.17405), X64 RyuJIT AVX2
+BenchmarkDotNet=v0.13.5, OS=Windows 11 (10.0.22621.1702/22H2/2022Update/SunValley2), VM=Hyper-V
+Intel Xeon Platinum 8370C CPU 2.80GHz, 1 CPU, 16 logical and 8 physical cores
+.NET SDK=7.0.304
+  [Host] : .NET 7.0.7 (7.0.723.27404), X64 RyuJIT AVX2
 
 Job=MediumRun  Toolchain=InProcessEmitToolchain  IterationCount=15  
 LaunchCount=2  WarmupCount=10  
 
 ```
-|  Method | Telemetry |        Mean |      Error |     StdDev |    Median |   Gen0 | Allocated |
-|-------- |---------- |------------:|-----------:|-----------:|----------:|-------:|----------:|
-| **Execute** |     **False** |    **90.27 ns** |   **0.823 ns** |   **1.207 ns** |  **90.34 ns** |      **-** |         **-** |
-|   Retry |     False |   435.25 ns |   8.593 ns |  12.595 ns | 433.63 ns |      - |         - |
-| **Execute** |      **True** |   **311.60 ns** |   **4.107 ns** |   **5.890 ns** | **311.37 ns** |      **-** |         **-** |
-|   Retry |      True | 1,004.07 ns | 106.845 ns | 159.921 ns | 922.31 ns | 0.0124 |     104 B |
+|  Method | Telemetry | Enrichment |        Mean |    Error |    StdDev |   Gen0 | Allocated |
+|-------- |---------- |----------- |------------:|---------:|----------:|-------:|----------:|
+| **Execute** |     **False** |      **False** |    **80.13 ns** | **0.324 ns** |  **0.486 ns** |      **-** |         **-** |
+| **Execute** |     **False** |       **True** |    **74.33 ns** | **0.286 ns** |  **0.392 ns** |      **-** |         **-** |
+| **Execute** |      **True** |      **False** |   **494.33 ns** | **3.973 ns** |  **5.698 ns** | **0.0029** |      **72 B** |
+| **Execute** |      **True** |       **True** | **1,157.27 ns** | **7.130 ns** | **10.450 ns** | **0.0286** |     **728 B** |

bench/Polly.Core.Benchmarks/TelemetryBenchmark.cs

@@ -1,28 +1,25 @@
 using Microsoft.Extensions.Logging.Abstractions;
+using Polly.Extensions.Telemetry;
+using Polly.Telemetry;
 
 namespace Polly.Core.Benchmarks;
 
 public class TelemetryBenchmark
 {
     private ResilienceStrategy? _strategy;
-    private ResilienceStrategy? _retryStrategy;
 
     [GlobalSetup]
     public void Prepare()
     {
         _strategy = Build(new ResilienceStrategyBuilder());
-        _retryStrategy = Build(new ResilienceStrategyBuilder().AddRetry(new RetryStrategyOptions
-        {
-            ShouldRetry = _ => PredicateResult.True,
-            RetryCount = 1,
-            BaseDelay = TimeSpan.Zero,
-            BackoffType = RetryBackoffType.Constant
-        }));
     }
 
     [Params(true, false)]
     public bool Telemetry { get; set; }
 
+    [Params(true, false)]
+    public bool Enrichment { get; set; }
+
     [Benchmark]
     public async ValueTask Execute()
     {
@@ -31,21 +28,49 @@ public async ValueTask Execute()
         ResilienceContext.Return(context);
     }
 
-    [Benchmark]
-    public async ValueTask Retry()
-    {
-        var context = ResilienceContext.Get();
-        await _retryStrategy!.ExecuteOutcomeAsync((_, _) => new ValueTask<Outcome<string>>(new Outcome<string>("dummy")), context, "state").ConfigureAwait(false);
-        ResilienceContext.Return(context);
-    }
-
     private ResilienceStrategy Build(ResilienceStrategyBuilder builder)
     {
+        builder.AddStrategy(context => new TelemetryEventStrategy(context.Telemetry), new EmptyResilienceOptions());
+
         if (Telemetry)
         {
-            builder.EnableTelemetry(NullLoggerFactory.Instance);
+            TelemetryResilienceStrategyOptions options = new() { LoggerFactory = NullLoggerFactory.Instance };
+
+            if (Enrichment)
+            {
+                options.Enrichers.Add(context =>
+                {
+                    // The Microsoft.Extensions.Resilience library will add around 6 additional tags
+                    // https://github.com/dotnet/extensions/tree/main/src/Libraries/Microsoft.Extensions.Resilience
+                    context.Tags.Add(new("dummy1", "dummy"));
+                    context.Tags.Add(new("dummy2", "dummy"));
+                    context.Tags.Add(new("dummy3", "dummy"));
+                    context.Tags.Add(new("dummy4", "dummy"));
+                    context.Tags.Add(new("dummy5", "dummy"));
+                    context.Tags.Add(new("dummy6", "dummy"));
+                });
+            }
+
+            builder.EnableTelemetry(options);
         }
 
         return builder.Build();
     }
+
+    private class TelemetryEventStrategy : ResilienceStrategy
+    {
+        private readonly ResilienceStrategyTelemetry _telemetry;
+
+        public TelemetryEventStrategy(ResilienceStrategyTelemetry telemetry) => _telemetry = telemetry;
+
+        protected override ValueTask<Outcome<TResult>> ExecuteCoreAsync<TResult, TState>(
+            Func<ResilienceContext, TState, ValueTask<Outcome<TResult>>> callback,
+            ResilienceContext context,
+            TState state)
+        {
+            _telemetry.Report("DummyEvent", context, "dummy-args");
+            return callback(context, state);
+        }
+    }
+
 }

bench/Polly.Core.Benchmarks/Utils/EmptyResilienceOptions.cs

@@ -0,0 +1,6 @@
+namespace Polly.Core.Benchmarks.Utils;
+
+internal sealed class EmptyResilienceOptions : ResilienceStrategyOptions
+{
+    public override string StrategyType => "Empty";
+}