Add ExperimentFramework.Diagnostics package with event sinks for standardized observability

[Copilot]

Description

Adds ExperimentFramework.Diagnostics package providing standardized event capture for experiment lifecycle events. Enables consistent logging, test assertions, and telemetry without bespoke per-app implementations.

Type of Change

• New feature (non-breaking change which adds functionality)
• Documentation update

Related Issues

Changes Made

Core Event Model

• ExperimentEvent discriminated union with 7 event kinds: TrialStarted, TrialEnded, RouteSelected, FallbackOccurred, ExceptionThrown, MethodInvoked, MethodCompleted
• IExperimentEventSink interface with OnEvent(in ExperimentEvent e) for pass-by-reference efficiency
• ExperimentEventPublisher bridge component with factory methods for framework integration

Built-in Sinks

• InMemoryExperimentEventSink: Bounded (ring buffer) or unbounded storage, thread-safe with ConcurrentQueue, query API for test assertions
• LoggerExperimentEventSink: Structured logging with event IDs 1001-1007, appropriate log levels (Debug/Info/Warning/Error/Trace)
• OpenTelemetryExperimentEventSink: Metrics (counters/histograms) for all events, activities for significant events (fallbacks/exceptions), BCL-only (System.Diagnostics)
• CompositeExperimentEventSink: Deterministic ordering, smart exception handling (filters critical exceptions, provides debug output for troubleshooting)

DI Extensions

• AddInMemoryExperimentEventSink(maxCapacity?), AddLoggerExperimentEventSink(categoryName?), AddOpenTelemetryExperimentEventSink()
• GetExperimentEventSinks() returns composite of all registered sinks

Documentation

• User guide: docs/user-guide/diagnostics.md with examples, performance notes, best practices
• Package README and main README updated
• Correct GitHub repository URLs (JerrettDavis/ExperimentFramework)

Code Quality Improvements

• Enhanced exception handling in CompositeExperimentEventSink to filter critical exceptions (OutOfMemoryException, StackOverflowException) while providing debug output for other failures
• Standardized test dependencies (xunit.runner.visualstudio 3.1.4) for consistency across test projects
• Added type safety checks in tests for improved test reliability

Example Usage

// Registration
services.AddInMemoryExperimentEventSink(maxCapacity: 1000);
services.AddLoggerExperimentEventSink();
services.AddOpenTelemetryExperimentEventSink();

// Testing
[Fact]
public async Task Experiment_RecordsFallback()
{
    var sink = provider.GetRequiredService<InMemoryExperimentEventSink>();
    await service.ExecuteAsync();
    
    var fallbacks = sink.GetEventsByKind(ExperimentEventKind.FallbackOccurred);
    Assert.Single(fallbacks);
    Assert.Equal("experimental", fallbacks[0].TrialKey);
    Assert.Equal("control", fallbacks[0].FallbackKey);
}

Testing

• Unit tests pass locally
• All existing tests pass
• Added new tests for new functionality

Test Configuration

• OS: Linux (Ubuntu)
• .NET Version: 10.0.101
• Tests: 40 new tests covering all sinks, bounded/unbounded storage, thread-safety, event filtering, DI registration, composite sinks

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Additional Context

Performance considerations:

• Events passed by reference (in parameter) to avoid allocations
• Bounded sinks use ring buffers to limit memory
• OTel sink selectively emits activities only for significant events
• No allocations in hot path for event forwarding

Exception handling strategy:

• CompositeExperimentEventSink filters critical exceptions (OutOfMemoryException, StackOverflowException) to allow them to propagate
• Non-critical exceptions from individual sinks are caught to prevent cascading failures
• Debug.WriteLine provides troubleshooting information without impacting production performance

Acceptance criteria met:

• ✅ Minimal allocations (pass-by-reference)
• ✅ Deterministic sink ordering (registration order)
• ✅ Bounded/unbounded in-memory storage
• ✅ Structured logs with event IDs
• ✅ OTel activities and metrics

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Feature] Add ExperimentFramework.Diagnostics package with first-class event sinks and in-memory/logging/OTel bridges</issue_title>
<issue_description>### Problem

ExperimentFramework supports decorators and logging, but event capture is not standardized. Teams implement bespoke logging/telemetry per app and per experiment.

A standardized event model enables:

• consistent logging
• consistent test assertions
• powering simulation reports

Goals

• Define stable ExperimentEvent types and sink contracts.

• Provide built-in sinks:

  • InMemoryExperimentEventSink (for tests)
  • LoggerExperimentEventSink (ILogger)
  • OpenTelemetryExperimentEventSink (when OTel package present)

Non-goals

• Not a full observability platform.

Proposed API Surface

• IExperimentEventSink with OnEvent(in ExperimentEvent e)

• ExperimentEvent (discriminated union style) with event kinds:

  • TrialStarted / TrialEnded
  • RouteSelected
  • FallbackOccurred
  • ExceptionThrown
  • (optional) MethodInvoked / MethodCompleted

Acceptance Criteria

• Core can publish events without allocating excessively.
• Sink ordering is deterministic.
• In-memory sink supports bounded storage (ring buffer) and unbounded (test-only).
• ILogger sink produces structured logs with event ids.
• Optional OTel sink emits activities/metrics.
• Docs: “Diagnostics & Tracing” with examples.

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Feature] Add ExperimentFramework.Diagnostics package with first-class event sinks and in-memory/logging/OTel bridges #58

---

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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

OpenSSF Scorecard

Package	Version	Score	Details
nuget/Microsoft.Extensions.DependencyInjection.Abstractions		🟢 6.9	Details Check Score Reason Maintained 🟢 10 30 commit(s) and 18 issue activity found in the last 90 days -- score normalized to 10 CII-Best-Practices ⚠️ 0 no effort to earn an OpenSSF best practices badge detected Code-Review 🟢 10 all changesets reviewed Packaging ⚠️ -1 packaging workflow not detected Security-Policy 🟢 10 security policy file detected Dangerous-Workflow 🟢 10 no dangerous workflow patterns detected License 🟢 10 license file detected Token-Permissions ⚠️ 0 detected GitHub workflow tokens with excessive permissions Branch-Protection 🟢 5 branch protection is not maximal on development and all release branches Signed-Releases ⚠️ -1 no releases found Binary-Artifacts 🟢 10 no binaries found in the repo SAST ⚠️ 0 SAST tool is not run on all commits -- score normalized to 0 Fuzzing ⚠️ 0 project is not fuzzed Pinned-Dependencies 🟢 9 dependency not pinned by hash detected -- score normalized to 9 Vulnerabilities 🟢 9 1 existing vulnerabilities detected
nuget/Microsoft.Extensions.Logging.Abstractions		🟢 6.9	Details Check Score Reason Maintained 🟢 10 30 commit(s) and 18 issue activity found in the last 90 days -- score normalized to 10 CII-Best-Practices ⚠️ 0 no effort to earn an OpenSSF best practices badge detected Code-Review 🟢 10 all changesets reviewed Packaging ⚠️ -1 packaging workflow not detected Security-Policy 🟢 10 security policy file detected Dangerous-Workflow 🟢 10 no dangerous workflow patterns detected License 🟢 10 license file detected Token-Permissions ⚠️ 0 detected GitHub workflow tokens with excessive permissions Branch-Protection 🟢 5 branch protection is not maximal on development and all release branches Signed-Releases ⚠️ -1 no releases found Binary-Artifacts 🟢 10 no binaries found in the repo SAST ⚠️ 0 SAST tool is not run on all commits -- score normalized to 0 Fuzzing ⚠️ 0 project is not fuzzed Pinned-Dependencies 🟢 9 dependency not pinned by hash detected -- score normalized to 9 Vulnerabilities 🟢 9 1 existing vulnerabilities detected
nuget/Microsoft.Extensions.DependencyInjection	10.0.1	Unknown	Unknown
nuget/Microsoft.Extensions.Logging	10.0.1	Unknown	Unknown
nuget/Microsoft.NET.Test.Sdk	17.14.1	🟢 5	Details Check Score Reason Code-Review 🟢 6 Found 12/18 approved changesets -- score normalized to 6 Maintained 🟢 10 25 commit(s) and 21 issue activity found in the last 90 days -- score normalized to 10 Packaging ⚠️ -1 packaging workflow not detected CII-Best-Practices ⚠️ 0 no effort to earn an OpenSSF best practices badge detected Dangerous-Workflow 🟢 10 no dangerous workflow patterns detected License 🟢 10 license file detected Security-Policy 🟢 10 security policy file detected Token-Permissions ⚠️ 0 detected GitHub workflow tokens with excessive permissions Branch-Protection ⚠️ -1 internal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md Signed-Releases ⚠️ -1 no releases found Binary-Artifacts ⚠️ 0 binaries present in source code SAST ⚠️ 0 SAST tool is not run on all commits -- score normalized to 0 Pinned-Dependencies ⚠️ 0 dependency not pinned by hash detected -- score normalized to 0 Fuzzing ⚠️ 0 project is not fuzzed Vulnerabilities 🟢 9 1 existing vulnerabilities detected
nuget/coverlet.collector	6.0.4	🟢 5.6	Details Check Score Reason Code-Review ⚠️ 2 Found 7/30 approved changesets -- score normalized to 2 Maintained 🟢 10 23 commit(s) and 17 issue activity found in the last 90 days -- score normalized to 10 Packaging ⚠️ -1 packaging workflow not detected Dangerous-Workflow 🟢 10 no dangerous workflow patterns detected CII-Best-Practices ⚠️ 0 no effort to earn an OpenSSF best practices badge detected Token-Permissions 🟢 9 detected GitHub workflow tokens with excessive permissions Binary-Artifacts 🟢 7 binaries present in source code License 🟢 10 license file detected Fuzzing ⚠️ 0 project is not fuzzed Signed-Releases ⚠️ 0 Project has not signed or included provenance with any releases. Branch-Protection ⚠️ -1 internal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md Pinned-Dependencies ⚠️ 0 dependency not pinned by hash detected -- score normalized to 0 Security-Policy ⚠️ 0 security policy file not detected Vulnerabilities 🟢 10 0 existing vulnerabilities detected SAST 🟢 8 SAST tool detected but not run on all commits
nuget/xunit	2.9.3	🟢 4.9	Details Check Score Reason Dangerous-Workflow 🟢 10 no dangerous workflow patterns detected Maintained 🟢 10 30 commit(s) and 27 issue activity found in the last 90 days -- score normalized to 10 Code-Review ⚠️ 1 Found 3/30 approved changesets -- score normalized to 1 CII-Best-Practices ⚠️ 0 no effort to earn an OpenSSF best practices badge detected License 🟢 9 license file detected Token-Permissions ⚠️ 0 detected GitHub workflow tokens with excessive permissions Packaging ⚠️ -1 packaging workflow not detected Branch-Protection ⚠️ -1 internal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md Signed-Releases ⚠️ -1 no releases found Security-Policy ⚠️ 0 security policy file not detected Binary-Artifacts 🟢 10 no binaries found in the repo Pinned-Dependencies ⚠️ 0 dependency not pinned by hash detected -- score normalized to 0 Fuzzing ⚠️ 0 project is not fuzzed SAST ⚠️ 0 SAST tool is not run on all commits -- score normalized to 0 Vulnerabilities 🟢 10 0 existing vulnerabilities detected
nuget/xunit.runner.visualstudio	3.1.4	Unknown	Unknown

Scanned Files

• src/ExperimentFramework.Diagnostics/ExperimentFramework.Diagnostics.csproj
• tests/ExperimentFramework.Diagnostics.Tests/ExperimentFramework.Diagnostics.Tests.csproj

[Copilot]

Pull request overview

This PR adds the ExperimentFramework.Diagnostics package to provide standardized event capture infrastructure for experiment lifecycle events. It enables consistent logging, test assertions, and telemetry without requiring bespoke implementations per application.

Changes:

• Introduces core event model with 7 event kinds and an IExperimentEventSink interface
• Provides three built-in sinks: InMemory (for testing), Logger (structured logging), and OpenTelemetry (metrics/activities)
• Adds DI extension methods for easy registration and composition of multiple sinks
• Includes comprehensive documentation and 40+ unit tests

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/ExperimentFramework.Diagnostics/ExperimentEvent.cs	Core event model with discriminated union pattern for 7 event types
src/ExperimentFramework.Diagnostics/IExperimentEventSink.cs	Interface definition with pass-by-reference efficiency
src/ExperimentFramework.Diagnostics/InMemoryExperimentEventSink.cs	Thread-safe in-memory sink with bounded/unbounded storage
src/ExperimentFramework.Diagnostics/LoggerExperimentEventSink.cs	Structured logging sink with event IDs 1001-1007
src/ExperimentFramework.Diagnostics/OpenTelemetryExperimentEventSink.cs	OpenTelemetry metrics and activities using BCL types
src/ExperimentFramework.Diagnostics/CompositeExperimentEventSink.cs	Composite pattern with deterministic ordering and exception isolation
src/ExperimentFramework.Diagnostics/ExperimentEventPublisher.cs	Bridge component with factory methods for event creation
src/ExperimentFramework.Diagnostics/ExperimentDiagnosticsExtensions.cs	DI extension methods for sink registration
src/ExperimentFramework.Diagnostics/ExperimentFramework.Diagnostics.csproj	Multi-target package configuration (net8.0, net9.0, net10.0)
tests/ExperimentFramework.Diagnostics.Tests/*	Comprehensive test coverage with 40+ tests for all sinks and scenarios
docs/user-guide/diagnostics.md	Complete user guide with examples and best practices
README.md	Updated main README with diagnostics section and example

---

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@39d101a). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #59   +/-   ##
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  Coverage        ?   83.23%           
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  Files           ?      184           
  Lines           ?     6860           
  Branches        ?      962           
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  Hits            ?     5710           
  Misses          ?     1150           
  Partials        ?        0           

Flag	Coverage Δ
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[JerrettDavis]

@copilot apply changes based on the comments in this thread

[JerrettDavis]

@copilot Retry

[Copilot]

@copilot Retry

Applied all code review feedback in commit b6b9354:

1. GitHub URLs: Updated from yourusername to JerrettDavis in ExperimentFramework.Diagnostics.csproj
2. Exception handling: Enhanced CompositeExperimentEventSink to filter critical exceptions (OutOfMemoryException, StackOverflowException) and added Debug.WriteLine for troubleshooting
3. xunit version: Standardized to 3.1.4 to match other test projects
4. Dictionary cast: Added Assert.IsType check before cast for safer test assertion

All 40 tests still passing.

[github-actions]

Code Coverage

Summary
  Generated on: 01/15/2026 - 19:40:50
  Coverage date: 01/15/2026 - 19:40:02 - 01/15/2026 - 19:40:33
  Parser: MultiReport (2x Cobertura)
  Assemblies: 19
  Classes: 215
  Files: 185
  Line coverage: 80.2%
  Covered lines: 5539
  Uncovered lines: 1359
  Coverable lines: 6898
  Total lines: 26073
  Branch coverage: 72% (2180 of 3026)
  Covered branches: 2180
  Total branches: 3026
  Method coverage: 88.4% (881 of 996)
  Full method coverage: 76.9% (766 of 996)
  Covered methods: 881
  Fully covered methods: 766
  Total methods: 996

ExperimentFramework                                                                                  90.4%
  ExperimentFramework.Activation.ActivationEvaluator                                                 93.1%
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  ExperimentFramework.Decorators.BenchmarkDecoratorFactory                                            100%
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  ExperimentFramework.Decorators.ErrorLoggingDecoratorFactory                                         100%
  ExperimentFramework.Decorators.TimeoutDecoratorFactory                                              100%
  ExperimentFramework.ExperimentBuilder                                                              81.1%
  ExperimentFramework.ExperimentBuilderExtensions                                                     100%
  ExperimentFramework.ExperimentFrameworkBuilder                                                      100%
  ExperimentFramework.ExperimentLoggingBuilder                                                        100%
  ExperimentFramework.ExperimentRegistry                                                              100%
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  ExperimentFramework.KillSwitch.KillSwitchDecoratorFactory                                           100%
  ExperimentFramework.KillSwitch.NoopKillSwitchProvider                                               100%
  ExperimentFramework.KillSwitch.TrialDisabledException                                               100%
  ExperimentFramework.Metrics.MetricsDecoratorFactory                                                 100%
  ExperimentFramework.Metrics.NoopExperimentMetrics                                                   100%
  ExperimentFramework.Models.BehaviorRule                                                             100%
  ExperimentFramework.Models.Experiment                                                               100%
  ExperimentFramework.Models.ExperimentRegistration                                                    75%
  ExperimentFramework.Models.SelectionModeExtensions                                                  100%
  ExperimentFramework.Models.SelectionRule                                                            100%
  ExperimentFramework.Models.ServiceExperimentDefinition<T>                                           100%
  ExperimentFramework.Models.Trial                                                                    100%
  ExperimentFramework.Naming.DefaultExperimentNamingConvention                                        100%
  ExperimentFramework.Naming.ExperimentSelectorName                                                   100%
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  ExperimentFramework.Selection.Providers.BooleanFeatureFlagProvider                                  100%
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  ExperimentFramework.Selection.Providers.ConfigurationValueProvider                                   80%
  ExperimentFramework.Selection.Providers.ConfigurationValueProviderFactory                           100%
  ExperimentFramework.Selection.SelectionModeAttribute                                                100%
  ExperimentFramework.Selection.SelectionModeProviderBase                                             100%
  ExperimentFramework.Selection.SelectionModeProviderFactory<T>                                       100%
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  ExperimentFramework.ServiceCollectionExtensions                                                    77.6%
  ExperimentFramework.ServiceExperimentBuilder<T>                                                    94.5%
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  ExperimentFramework.Telemetry.OpenTelemetryExperimentTelemetry                                      100%
  ExperimentFramework.Validation.TrialConflictDetector                                               98.7%
  ExperimentFramework.Validation.TrialConflictException                                               100%
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ExperimentFramework.Admin                                                                            33.4%
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ExperimentFramework.Audit                                                                               0%
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ExperimentFramework.AutoStop                                                                          100%
  ExperimentFramework.AutoStop.AutoStopOptions                                                        100%
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  ExperimentFramework.AutoStop.Rules.StatisticalSignificanceRule                                      100%
  ExperimentFramework.AutoStop.ServiceCollectionExtensions                                            100%
  ExperimentFramework.AutoStop.VariantData                                                            100%

ExperimentFramework.Bandit                                                                           98.8%
  ExperimentFramework.Bandit.Algorithms.EpsilonGreedy                                                 100%
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  ExperimentFramework.Bandit.ArmStatistics                                                            100%
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ExperimentFramework.Configuration                                                                    68.6%
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  ExperimentFramework.Configuration.Exceptions.ExperimentConfigurationException                       100%
  ExperimentFramework.Configuration.Exceptions.TypeResolutionException                                100%
  ExperimentFramework.Configuration.Extensions.ConfigurationExtensionRegistry                        79.1%
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  ExperimentFramework.Configuration.Extensions.Handlers.CustomDecoratorHandler                       93.7%
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ExperimentFramework.Data                                                                             98.1%
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ExperimentFramework.Distributed                                                                      94.6%
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ExperimentFramework.Distributed.Redis                                                                 100%
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ExperimentFramework.FeatureManagement                                                                  80%
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ExperimentFramework.Governance                                                                       33.4%
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ExperimentFramework.Metrics.Exporters                                                                99.3%
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ExperimentFramework.OpenFeature                                                                        80%
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ExperimentFramework.Plugins                                                                            87%
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  ExperimentFramework.Plugins.ServiceCollectionExtensions                                             100%

ExperimentFramework.Resilience                                                                         99%
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  ExperimentFramework.Resilience.ResilienceServiceCollectionExtensions                               85.7%

ExperimentFramework.Rollout                                                                          98.7%
  ExperimentFramework.Rollout.Configuration.RolloutSelectionModeHandler                               100%
  ExperimentFramework.Rollout.Configuration.StagedRolloutSelectionModeHandler                        97.9%
  ExperimentFramework.Rollout.ExperimentBuilderExtensions                                             100%
  ExperimentFramework.Rollout.RolloutAllocator                                                         95%
  ExperimentFramework.Rollout.RolloutProvider                                                         100%
  ExperimentFramework.Rollout.ServiceCollectionExtensions                                             100%
  ExperimentFramework.Rollout.StagedRolloutOptions                                                    100%
  ExperimentFramework.Rollout.StagedRolloutProvider                                                   100%

ExperimentFramework.Science                                                                          88.8%
  ExperimentFramework.Science.Analysis.ExperimentAnalyzer                                            88.3%
  ExperimentFramework.Science.Builders.EndpointBuilder                                                100%
  ExperimentFramework.Science.Builders.HypothesisBuilder                                              100%
  ExperimentFramework.Science.Builders.SuccessCriteriaBuilder                                         100%
  ExperimentFramework.Science.Corrections.BenjaminiHochbergCorrection                                 100%
  ExperimentFramework.Science.Corrections.BonferroniCorrection                                        100%
  ExperimentFramework.Science.Corrections.HolmBonferroniCorrection                                    100%
  ExperimentFramework.Science.EffectSize.CohensD                                                      100%
  ExperimentFramework.Science.EffectSize.EffectSizeExtensions                                         100%
  ExperimentFramework.Science.EffectSize.OddsRatio                                                    100%
  ExperimentFramework.Science.EffectSize.RelativeRisk                                                 100%
  ExperimentFramework.Science.Models.Hypothesis.Endpoint                                                0%
  ExperimentFramework.Science.Models.Hypothesis.HypothesisDefinition                                    0%
  ExperimentFramework.Science.Models.Results.StatisticalTestResult                                   66.6%
  ExperimentFramework.Science.Models.Snapshots.EnvironmentInfo                                          0%
  ExperimentFramework.Science.Power.PowerAnalyzer                                                    78.7%
  ExperimentFramework.Science.Reporting.JsonReporter                                                 88.8%
  ExperimentFramework.Science.Reporting.MarkdownReporter                                             72.8%
  ExperimentFramework.Science.ServiceCollectionExtensions                                             100%
  ExperimentFramework.Science.Snapshots.InMemorySnapshotStore                                        90.1%
  ExperimentFramework.Science.Statistics.ChiSquareTest                                               79.1%
  ExperimentFramework.Science.Statistics.MannWhitneyUTest                                            97.3%
  ExperimentFramework.Science.Statistics.OneWayAnova                                                 98.4%
  ExperimentFramework.Science.Statistics.PairedTTest                                                 81.5%
  ExperimentFramework.Science.Statistics.TwoSampleTTest                                              88.4%

ExperimentFramework.StickyRouting                                                                    92.5%
  ExperimentFramework.StickyRouting.ExperimentBuilderExtensions                                       100%
  ExperimentFramework.StickyRouting.ServiceCollectionExtensions                                       100%
  ExperimentFramework.StickyRouting.StickyRoutingProvider                                            86.6%
  ExperimentFramework.StickyRouting.StickyTrialRouter                                                 100%

ExperimentFramework.Targeting                                                                         100%
  ExperimentFramework.Targeting.Configuration.TargetingSelectionModeHandler                           100%
  ExperimentFramework.Targeting.InMemoryTargetingConfiguration                                        100%
  ExperimentFramework.Targeting.ServiceCollectionExtensions                                           100%
  ExperimentFramework.Targeting.SimpleTargetingContext                                                100%
  ExperimentFramework.Targeting.TargetingProvider                                                     100%
  ExperimentFramework.Targeting.TargetingRules                                                        100%