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Add instructions for bisecting upstream regressions #4509

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Oct 20, 2025
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Add instructions for bisecting upstream regressions #4509

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21 changes: 21 additions & 0 deletions .github/copilot-instructions.md
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Original file line number Diff line number Diff line change
Expand Up @@ -134,3 +134,24 @@ throw new FriendlyException(
- Use `hideFromDependabot()` for test-only dependencies
- Smoke tests validate end-to-end functionality in realistic environments
- Check `gradle.lockfile` when dependency issues arise

## How to bisect an upstream OpenTelemetry Agent regression

To identify which upstream commit introduced a regression:

1. Update `dependencyManagement/build.gradle.kts` to use SNAPSHOT version (e.g., `2.10.0-alpha-SNAPSHOT`)
2. Clone and bisect the upstream repo:
```bash
git clone https://github.com/open-telemetry/opentelemetry-java-instrumentation.git
cd opentelemetry-java-instrumentation
git bisect start v2.10.0 v2.9.0
```
3. For each bisect iteration:
```bash
./gradlew publishToMavenLocal
cd /path/to/ApplicationInsights-Java
./gradlew :smoke-tests:apps:YourApp:smokeTest --tests "*YourFailingTest"
cd /path/to/opentelemetry-java-instrumentation
git bisect good # or bad
```
4. When done: `git bisect reset` and restore `dependencyManagement/build.gradle.kts`