Remove EnableAdaptiveSampling and replace with TracesPerSecond and SamplingRatio

.publicApi/Microsoft.ApplicationInsights.AspNetCore.dll/Stable/PublicAPI.Unshipped.txt

@@ -8,8 +8,6 @@ Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOp
 Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.ConnectionString.set -> void
 Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.Credential.get -> Azure.Core.TokenCredential
 Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.Credential.set -> void
-Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.EnableAdaptiveSampling.get -> bool
-Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.EnableAdaptiveSampling.set -> void
 Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.EnableAuthenticationTrackingJavaScript.get -> bool
 Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.EnableAuthenticationTrackingJavaScript.set -> void
 Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.EnableDependencyTrackingTelemetryModule.get -> bool
@@ -18,6 +16,10 @@ Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOp
 Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.EnablePerformanceCounterCollectionModule.set -> void
 Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.EnableQuickPulseMetricStream.get -> bool
 Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.EnableQuickPulseMetricStream.set -> void
+Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.SamplingRatio.get -> float?
+Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.SamplingRatio.set -> void
+Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.TracesPerSecond.get -> double?
+Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.TracesPerSecond.set -> void
 Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.EnableRequestTrackingTelemetryModule.get -> bool
 Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions.EnableRequestTrackingTelemetryModule.set -> void
 Microsoft.ApplicationInsights.AspNetCore.IJavaScriptSnippet

.publicApi/Microsoft.ApplicationInsights.WorkerService.dll/Stable/PublicAPI.Unshipped.txt

@@ -8,14 +8,16 @@ Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions.Co
 Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions.ConnectionString.set -> void
 Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions.Credential.get -> Azure.Core.TokenCredential
 Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions.Credential.set -> void
-Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions.EnableAdaptiveSampling.get -> bool
-Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions.EnableAdaptiveSampling.set -> void
 Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions.EnableDependencyTrackingTelemetryModule.get -> bool
 Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions.EnableDependencyTrackingTelemetryModule.set -> void
 Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions.EnablePerformanceCounterCollectionModule.get -> bool
 Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions.EnablePerformanceCounterCollectionModule.set -> void
 Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions.EnableQuickPulseMetricStream.get -> bool
 Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions.EnableQuickPulseMetricStream.set -> void
+Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions.SamplingRatio.get -> float?
+Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions.SamplingRatio.set -> void
+Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions.TracesPerSecond.get -> double?
+Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions.TracesPerSecond.set -> void
 Microsoft.Extensions.DependencyInjection.ApplicationInsightsExtensions
 static Microsoft.Extensions.DependencyInjection.ApplicationInsightsExtensions.AddApplicationInsightsTelemetryWorkerService(this Microsoft.Extensions.DependencyInjection.IServiceCollection services) -> Microsoft.Extensions.DependencyInjection.IServiceCollection
 static Microsoft.Extensions.DependencyInjection.ApplicationInsightsExtensions.AddApplicationInsightsTelemetryWorkerService(this Microsoft.Extensions.DependencyInjection.IServiceCollection services, Microsoft.ApplicationInsights.WorkerService.ApplicationInsightsServiceOptions options) -> Microsoft.Extensions.DependencyInjection.IServiceCollection

BreakingChanges.md

@@ -217,12 +217,10 @@ The following extension methods remain with identical signatures:
 - ❌ **`EnableHeartbeat`** - Heartbeat configuration removed
 - ❌ **`RequestCollectionOptions`** - Removed (non-functional, use OpenTelemetry instrumentation options)
 - ❌ **`DependencyCollectionOptions`** - Removed (non-functional, use OpenTelemetry instrumentation options)
+- ❌ `EnableAdaptiveSampling`** - Removed, rate limited sampling is now the default.
 
 ### Properties Retained
 - ✅ **`ConnectionString`** - Primary configuration method
-- ✅ **`EnableAdaptiveSampling`** - Still configurable (but behavior changed)
-  - **2.x**: Controls traditional adaptive sampling
-  - **3.x**: Maps to rate-limit based sampling in Azure Monitor Exporter, set at 5 OpenTelemetry traces per second by default
 - ✅ **`ApplicationVersion`**
 - ✅ **`AddAutoCollectedMetricExtractor`**
 - ✅ **`EnableQuickPulseMetricStream`** 
@@ -234,6 +232,8 @@ The following extension methods remain with identical signatures:
 
 ### New Properties Added in 3.x
 - ✅ **`Credential`** (Azure.Core.TokenCredential) - Enables Azure Active Directory (AAD) authentication
+- ✅ **`TracesPerSecond`** (double?) - Gets or sets the number of traces per second for rate-limited sampling (default sampling mode). Replaces `EnableAdaptiveSampling`.
+- ✅ **`SamplingRatio`** (float?) - Gets or sets the sampling ratio for traces (0.0 to 1.0). A value of 1.0 means all telemetry is sent. Replaces `EnableAdaptiveSampling`.
 
 ### JavaScriptSnippet Constructor Change
 **2.x:**
@@ -285,17 +285,22 @@ The following extension methods remain with identical signatures:
 - ❌ **`DeveloperMode`** - No longer configurable
 - ❌ **`EndpointAddress`** - No longer configurable (`ConnectionString` contains endpoints)
 - ❌ **`DependencyCollectionOptions`** - Removed (non-functional, use OpenTelemetry instrumentation options)
+- ❌ **`EnableAdaptiveSampling`** - Removed, rate limited sampling is now the default.
 
 ### Properties Retained
 - ✅ **`ConnectionString`** - Primary configuration method (maps to `AzureMonitorExporterOptions.ConnectionString`)
 - ✅ **`ApplicationVersion`** - Still configurable
-- ✅ **`EnableAdaptiveSampling`** - When true the rate limited sampler is used at 5 traces per second.
 - ✅ **`EnableDependencyTrackingTelemetryModule`** - Still configurable
 - ✅ **`EnablePerformanceCounterCollectionModule`** - Still configurable
 - ✅ **`EnableQuickPulseMetricStream`** - Maps to `AzureMonitorExporterOptions.EnableLiveMetrics`
 - ✅ **`EnableDebugLogger`** - Still configurable though has no effect
 - ✅ **`AddAutoCollectedMetricExtractor`** - Still configurable
 
+### New Properties Added in 3.x
+- ✅ **`Credential`** (Azure.Core.TokenCredential) - Enables Azure Active Directory (AAD) authentication
+- ✅ **`TracesPerSecond`** (double?) - Gets or sets the number of traces per second for rate-limited sampling (default sampling mode). Replaces `EnableAdaptiveSampling`.
+- ✅ **`SamplingRatio`** (float?) - Gets or sets the sampling ratio for traces (0.0 to 1.0). A value of 1.0 means all telemetry is sent. Replaces `EnableAdaptiveSampling`.
+
 ## Migration Impact
 - Any code depending on `InstrumentationKey` must migrate to `ConnectionString`
 - Code checking or configuring the removed options (`DeveloperMode`, `EndpointAddress`, etc.) will break

CHANGELOG.md

@@ -12,6 +12,7 @@
   - OpenTelemetry.Instrumentation.SqlClient 1.15.0-rc.1
   - OpenTelemetry.Resources.Azure 1.15.0-beta.1
 - [Added support to disable telemetry via TelemetryConfiguration.DisableTelemetry](https://github.com/microsoft/ApplicationInsights-dotnet/pull/3084)
+- [Removed `EnabledAdaptiveSampling` and replaced with `TracesPerSecond` and `SamplingRatio`](https://github.com/microsoft/ApplicationInsights-dotnet/pull/3085)
 
 ## Version 3.0.0-beta2
 ### Added

NETCORE/Readme.md

@@ -159,11 +159,6 @@ builder.Services.AddApplicationInsightsTelemetry(options =>
 
     // Enable or disable Live Metrics (default: true)
     options.EnableQuickPulseMetricStream = true;
-
-    // Enable or disable adaptive sampling (default: true)
-    // When true, enables rate-limit based sampling in Azure Monitor Exporter
-    // When false, sampling is disabled (100% collection)
-    options.EnableAdaptiveSampling = true;
 });
 ```
 
@@ -367,17 +362,6 @@ builder.Services.AddApplicationInsightsTelemetry(options =>
 });
 ```
 
-#### Disabling Adaptive Sampling
-
-To collect 100% of telemetry (disable sampling):
-
-```csharp
-builder.Services.AddApplicationInsightsTelemetry(options =>
-{
-    options.EnableAdaptiveSampling = false;
-});
-```
-
 #### Dropping Specific Metrics Instruments
 
 To exclude specific instruments from being collected:
@@ -464,8 +448,6 @@ The following features are **no longer available** in version 3.x:
 
 3. **Configuration** - Connection strings are now configured via `ApplicationInsightsServiceOptions.ConnectionString` or `APPLICATIONINSIGHTS_CONNECTION_STRING` environment variable.
 
-4. **Sampling** - Sampling is now controlled by the `EnableAdaptiveSampling` option, which configures the Azure Monitor Exporter's sampling behavior.
-
 5. **Live Metrics** - Still supported via the `EnableQuickPulseMetricStream` option.
 
 ### Migration Steps
@@ -898,7 +880,6 @@ After migrating, thoroughly test your application to ensure:
 - [ ] Remove all ITelemetryProcessor implementations
 - [ ] Remove all custom ITelemetryModule implementations
 - [ ] Replace RequestCollectionOptions with AspNetCoreTraceInstrumentationOptions
-- [ ] Update sampling configuration (use EnableAdaptiveSampling)
 - [ ] Test all custom telemetry collection
 - [ ] Verify Live Metrics is working (if enabled)
 - [ ] Verify all expected telemetry appears in Azure Monitor

NETCORE/WorkerService.md

@@ -119,7 +119,6 @@ builder.Services.AddApplicationInsightsTelemetryWorkerService(options =>
 {
     options.ConnectionString = "InstrumentationKey=...";
     options.EnableQuickPulseMetricStream = true;
-    options.EnableAdaptiveSampling = true;
 });
 ```
 

NETCORE/src/Microsoft.ApplicationInsights.AspNetCore/Extensions/ApplicationInsightsExtensions.cs

@@ -210,12 +210,6 @@ internal static IOpenTelemetryBuilder UseApplicationInsightsTelemetry(this IOpen
                     {
                         exporterOptions.Credential = serviceOptions.Credential;
                     }
-
-                    if (!serviceOptions.EnableAdaptiveSampling)
-                    {
-                        exporterOptions.SamplingRatio = 1.0F;
-                        exporterOptions.TracesPerSecond = null;
-                    }
 
                     if (serviceOptions.EnableQuickPulseMetricStream)
                     {
@@ -226,6 +220,34 @@ internal static IOpenTelemetryBuilder UseApplicationInsightsTelemetry(this IOpen
                         exporterOptions.EnableLiveMetrics = false;
                     }
 
+                    if (serviceOptions.TracesPerSecond.HasValue)
+                    {
+                        if (serviceOptions.TracesPerSecond.Value >= 0)
+                        {
+                            exporterOptions.TracesPerSecond = serviceOptions.TracesPerSecond.Value;
+                        }
+                        else 
+                        {
+                            AspNetCoreEventSource.Instance.LogError($"Invalid TracesPerSecond value '{serviceOptions.TracesPerSecond.Value}'. Value must be at least 0. Using default value.");     
+                        }
+                    }
+
+                    if (serviceOptions.SamplingRatio.HasValue)
+                    {
+                        if (serviceOptions.SamplingRatio.Value >= 0.0f && serviceOptions.SamplingRatio.Value <= 1.0f) 
+                        {
+                            exporterOptions.SamplingRatio = serviceOptions.SamplingRatio.Value;
+                            if (!serviceOptions.TracesPerSecond.HasValue)
+                            {
+                                exporterOptions.TracesPerSecond = null;
+                            }
+                        }
+                        else
+                        {
+                            AspNetCoreEventSource.Instance.LogError($"Invalid SamplingRatio value '{serviceOptions.SamplingRatio.Value}'. Value must be between 0.0 and 1.0. Using default value.");
+                        }
+                    }
+
                     // Configure standard metrics and performance counter collection using reflection
                     // Only set when false since the default is true
                     if (!serviceOptions.AddAutoCollectedMetricExtractor)

NETCORE/src/Microsoft.ApplicationInsights.WorkerService/ApplicationInsightsExtensions.cs

@@ -206,13 +206,35 @@ internal static IOpenTelemetryBuilder UseApplicationInsightsTelemetry(this IOpen
                         exporterOptions.Credential = serviceOptions.Credential;
                     }
 
-                    if (!serviceOptions.EnableAdaptiveSampling)
+                    exporterOptions.EnableLiveMetrics = serviceOptions.EnableQuickPulseMetricStream;
+
+                    if (serviceOptions.TracesPerSecond.HasValue)
                     {
-                        exporterOptions.SamplingRatio = 1.0F;
-                        exporterOptions.TracesPerSecond = null;
+                        if (serviceOptions.TracesPerSecond.Value >= 0)
+                        {
+                            exporterOptions.TracesPerSecond = serviceOptions.TracesPerSecond.Value;
+                        }
+                        else 
+                        {
+                            WorkerServiceEventSource.Instance.LogError($"Invalid TracesPerSecond value '{serviceOptions.TracesPerSecond.Value}'. Value must be at least 0. Using default value.");     
+                        }    
                     }
 
-                    exporterOptions.EnableLiveMetrics = serviceOptions.EnableQuickPulseMetricStream;
+                    if (serviceOptions.SamplingRatio.HasValue)
+                    {
+                        if (serviceOptions.SamplingRatio.Value >= 0.0f && serviceOptions.SamplingRatio.Value <= 1.0f) 
+                        {
+                            exporterOptions.SamplingRatio = serviceOptions.SamplingRatio.Value;
+                            if (!serviceOptions.TracesPerSecond.HasValue)
+                            {
+                                exporterOptions.TracesPerSecond = null;
+                            }
+                        }
+                        else
+                        {
+                            WorkerServiceEventSource.Instance.LogError($"Invalid SamplingRatio value '{serviceOptions.SamplingRatio.Value}'. Value must be between 0.0 and 1.0. Using default value.");
+                        }
+                    }
 
                     // Configure standard metrics and performance counter collection using reflection
                     // Only set when false since the default is true

NETCORE/src/Shared/Extensions/ApplicationInsightsServiceOptions.cs

@@ -30,14 +30,6 @@ public class ApplicationInsightsServiceOptions
         /// </summary>
         public bool EnableDependencyTrackingTelemetryModule { get; set; } = true;
 
-        /// <summary>
-        /// Gets or sets a value indicating whether telemetry processor that controls sampling is added to the service.
-        /// Setting EnableAdaptiveSampling to <value>false</value>, will disable sampling entirely. 
-        /// When <value>true</value> (default), enables rate-limit based sampling in Azure Monitor Exporter.
-        /// Defaults to <value>true</value>.
-        /// </summary>
-        public bool EnableAdaptiveSampling { get; set; } = true;
-
         /// <summary>
         /// Gets or sets the connection string for the application.
         /// </summary>
@@ -61,6 +53,17 @@ public class ApplicationInsightsServiceOptions
         /// </summary>
         public bool AddAutoCollectedMetricExtractor { get; set; } = true;
 
+        /// <summary>
+        /// Gets or sets the target number of traces per second to be collected.
+        /// </summary>
+        public double? TracesPerSecond { get; set; }
+
+        /// <summary>
+        /// Gets or sets the sampling ratio for telemetry.
+        /// Value must be between 0.0 and 1.0, where 1.0 means all telemetry is collected (no sampling).
+        /// </summary>
+        public float? SamplingRatio { get; set; }
+
 #if AI_ASPNETCORE_WEB
         /// <summary>
         /// Gets or sets a value indicating whether RequestTrackingTelemetryModule should be enabled.
@@ -92,11 +95,12 @@ internal void CopyPropertiesTo(ApplicationInsightsServiceOptions target)
             }
 
             target.ApplicationVersion = this.ApplicationVersion;
-            target.EnableAdaptiveSampling = this.EnableAdaptiveSampling;
             target.EnableQuickPulseMetricStream = this.EnableQuickPulseMetricStream;
             target.AddAutoCollectedMetricExtractor = this.AddAutoCollectedMetricExtractor;
             target.EnablePerformanceCounterCollectionModule = this.EnablePerformanceCounterCollectionModule;
             target.EnableDependencyTrackingTelemetryModule = this.EnableDependencyTrackingTelemetryModule;
+            target.TracesPerSecond = this.TracesPerSecond;
+            target.SamplingRatio = this.SamplingRatio;
 
 #if AI_ASPNETCORE_WEB
             target.EnableAuthenticationTrackingJavaScript = this.EnableAuthenticationTrackingJavaScript;

NETCORE/test/IntegrationTests.Tests/CustomWebApplicationFactory.cs

@@ -43,8 +43,8 @@ protected override void ConfigureWebHost(IWebHostBuilder builder)
                 {
                     options.AddAutoCollectedMetricExtractor = false;
                     options.EnableQuickPulseMetricStream = false;
-                    options.EnableAdaptiveSampling = false;
                     options.ConnectionString = "InstrumentationKey=ikey";
+                    options.SamplingRatio = 1.0f; // 100% telemetry flow in tests
                 });
             });
         }

NETCORE/test/IntegrationTests.Tests/content/config-all-default.json

@@ -1,7 +1,6 @@
 {
   "ApplicationInsights": {
     "ConnectionString": "InstrumentationKey=11111111-2222-3333-4444-555555555555;IngestionEndpoint=http://testendpoint",
-    "EnableAdaptiveSampling": false,
     "EnableQuickPulseMetricStream": true,
     "ApplicationVersion": "Version"
   }

NETCORE/test/IntegrationTests.Tests/content/config-all-settings-false.json

@@ -1,7 +1,6 @@
 {
   "ApplicationInsights": {
     "ConnectionString": "InstrumentationKey=22222222-2222-3333-4444-555555555555",
-    "EnableAdaptiveSampling": false,
     "EnableQuickPulseMetricStream": false
   }
 }

NETCORE/test/IntegrationTests.Tests/content/config-all-settings-true.json

@@ -1,7 +1,6 @@
 {
   "ApplicationInsights": {
     "ConnectionString": "InstrumentationKey=22222222-2222-3333-4444-555555555555",
-    "EnableAdaptiveSampling": true,
     "EnableQuickPulseMetricStream": true,
     "ApplicationVersion": "1.0.0"
   }

NETCORE/test/IntegrationTests.Tests/content/config-sampling-tracespersecond.json

@@ -0,0 +1,6 @@
+{
+  "ApplicationInsights": {
+    "ConnectionString": "InstrumentationKey=33333333-4444-5555-6666-777777777777",
+    "TracesPerSecond": 10.0
+  }
+}

NETCORE/test/IntegrationTests.Tests/content/config-samplingratio.json

@@ -0,0 +1,6 @@
+{
+  "ApplicationInsights": {
+    "ConnectionString": "InstrumentationKey=44444444-5555-6666-7777-888888888888",
+    "SamplingRatio": 0.5
+  }
+}