add AGENTS.md to test-infra repo

AGENTS.md

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+# AGENTS.md
+
+This file provides guidance to AI assistants when working with code in this repository.
+
+## Repository Overview
+
+This is kubernetes/test-infra, which contains tools and configuration files for testing and automation needs of the Kubernetes project. The main components are:
+
+- **Prow Jobs**: CI/CD job configurations at prow.k8s.io (config/jobs/)
+- **TestGrid**: Test result visualization at testgrid.k8s.io (testgrid/)
+- **Kettle**: Extracts test results from GCS to BigQuery (kettle/)
+- **Label Sync**: Manages GitHub labels across repos (label_sync/)
+- **Gopherage**: Go coverage file manipulation (gopherage/)
+- **Experiment**: One-off tools and scripts (experiment/)
+
+Note: Prow source code moved to kubernetes-sigs/prow in April 2024. This repo now contains prow job configurations and test-infra specific tooling.
+
+## Building and Testing
+
+### Running Tests
+
+```bash
+# Run all tests (Go + Python unit tests)
+make test
+
+# Run only Go unit tests
+make go-unit
+
+# Run only Python unit tests
+make py-unit
+
+# Test a specific Go package or folder
+hack/make-rules/go-test/unit.sh <folder>
+# Examples:
+hack/make-rules/go-test/unit.sh kettle/...
+hack/make-rules/go-test/unit.sh pkg/benchmarkjunit/...
+```
+
+### Verification and Linting
+
+```bash
+# Run all verification checks
+make verify
+
+# Run specific verifications
+make go-lint           # golangci-lint checks
+make verify-gofmt      # Go formatting
+make verify-eslint     # TypeScript/JavaScript linting
+make py-lint           # Python linting
+make verify-boilerplate # License header checks
+make verify-yamllint   # YAML linting
+make verify-spelling   # Spell checking
+make verify-labels     # GitHub label validation
+make verify-file-perms # File permission checks
+make verify-generated-jobs # Verify generated jobs are up to date
+```
+
+### Auto-fixing Issues
+
+```bash
+# Auto-format Go code
+make update-gofmt
+
+# Update Go dependencies (after changing go.mod)
+make update-go-deps
+
+# Auto-fix spelling mistakes
+make update-spelling
+
+# Update file permissions
+make update-file-perms
+
+# Regenerate generated job configs
+make generate-jobs
+```
+
+## Dependency Management
+
+This repo uses Go modules. Key rules:
+
+- **NEVER add `replace` directives to go.mod** - this breaks published packages
+- Run `make update-go-deps` after modifying go.mod
+- Use `hack/make-rules/go-run/arbitrary.sh go <command>` instead of `go <command>` to ensure correct Go version (1.25.3)
+- See docs/dep.md for complete details
+
+## Working with Prow Jobs
+
+Job configurations live in `config/jobs/`. The directory structure is:
+- `org/repo/filename.yaml` for most repos
+- `kubernetes/sig-foo/filename.yaml` for kubernetes/kubernetes jobs
+
+### Job Types
+
+- **Presubmits**: Run on PRs before merge
+- **Postsubmits**: Run after code is merged
+- **Periodics**: Run on a schedule
+
+### Adding or Updating Jobs
+
+1. Create/edit YAML in config/jobs/ following the org/repo structure
+2. Ensure an OWNERS file exists in the directory
+3. Add testgrid annotations to display results:
+   ```yaml
+   annotations:
+     testgrid-dashboards: sig-foo-bar
+     testgrid-tab-name: pull-verify
+   ```
+4. Open PR - changes auto-deploy when merged
+5. Optionally test locally: `config/mkpj.sh` or `config/pj-on-kind.sh`
+
+See config/jobs/README.md for comprehensive job configuration guide.
+
+### Generated Jobs
+
+Some jobs are auto-generated and should NOT be edited directly:
+
+- **Image validation jobs**: Edit releng/test_config.yaml then run `./hack/update-generated-tests.sh`
+- **Release branch jobs**: Use releng/config-forker to fork master jobs for new release branches
+
+Always run `make verify-generated-jobs` before submitting PRs.
+
+## TestGrid Configuration
+
+TestGrid displays test results at testgrid.k8s.io. Two ways to configure:
+
+1. **Simple (recommended)**: Add annotations to prow job YAML:
+   ```yaml
+   annotations:
+     testgrid-dashboards: sig-testing-misc
+     testgrid-tab-name: pull-verify
+   ```
+
+2. **Advanced**: Edit testgrid/config.yaml directly
+
+See testgrid/README.md and testgrid/config.md for details.
+
+## Image Building
+
+```bash
+# Build all misc images (local)
+make build-misc-images
+
+# Build single image (local)
+make build-single-image PROW_IMAGE=<image-name>
+
+# Push all misc images to registry
+make push-misc-images REGISTRY=gcr.io/k8s-staging-test-infra
+
+# Push single image to registry
+make push-single-image PROW_IMAGE=<image-name> REGISTRY=gcr.io/k8s-staging-test-infra
+```
+
+Images are configured in .test-infra-misc-images.yaml
+
+## Repository Structure
+
+Key directories:
+
+- **config/**: Prow configuration and job definitions
+  - **config/jobs/**: All prow job configs (org/repo structure)
+  - **config/prow/**: Prow cluster configuration
+  - **config/testgrids/**: TestGrid dashboard configs
+- **hack/**: Build and test scripts
+  - **hack/make-rules/**: Make targets for testing/verification
+  - **hack/tools/**: Tool dependencies (gotestsum, etc.)
+- **releng/**: Release engineering tools
+  - **releng/config-forker**: Fork jobs for new release branches
+  - **releng/test_config.yaml**: Image validation job config
+- **pkg/**: Shared Go packages (minimal, most moved to prow repo)
+- **testgrid/**: TestGrid-specific configs and docs
+- **kettle/**: BigQuery data pipeline
+- **label_sync/**: GitHub label management
+- **experiment/**: Ad-hoc scripts and tools
+
+## Architecture Notes
+
+- Prow jobs run in Kubernetes pods on the prow.k8s.io cluster
+- Test results stored in GCS buckets (kubernetes-ci-logs)
+- Kettle extracts GCS results → BigQuery for metrics/analysis
+- TestGrid reads from GCS to display historical results
+- GitHub webhooks trigger presubmit jobs on PRs
+- Jobs use presets (defined in config/prow/config.yaml) for common credentials/config
+
+## Common Workflows
+
+### Updating Job Configs
+1. Edit YAML in config/jobs/org/repo/
+2. Run `make verify` to check for issues
+3. Commit and open PR
+4. Changes auto-deploy on merge
+
+### Adding New Release Branch Jobs
+```bash
+go run ./releng/config-forker \
+  --job-config $(pwd)/config/jobs \
+  --version 1.27 \
+  --go-version 1.20.2 \
+  --output $(pwd)/config/jobs/kubernetes/sig-release/release-branch-jobs/1.27.yaml
+```
+
+### Testing Locally
+```bash
+# Test prow job config locally
+config/pj-on-kind.sh
+
+# Create prowjob CR from local config
+config/mkpj.sh
+```
+
+## CI and PR Workflow
+
+- All PRs checked by presubmit jobs configured in config/jobs/
+- Use `/test <job-name>` to trigger specific jobs
+- Use `/retest` to re-run failed jobs
+- Jobs automatically deployed when PRs merge to master
+- Use `/hold` to prevent auto-merge, `/hold cancel` to release
+- Use `/cc @person` or `/assign @person` to notify reviewers
+- See https://prow.k8s.io/command-help for all bot commands
+
+## Contact
+
+- SIG Testing owns this repo
+- Slack: #sig-testing, #testing-ops, #prow, #testgrid
+- Mailing list: kubernetes-sig-testing@googlegroups.com

CLAUDE.md

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+@AGENTS.md

GEMINI.md

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+@AGENTS.md