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feat(coverage): implement automated coverage validation tool (#14098)
Key features: - Validates stable components meet 80% coverage minimum - Supports repository-wide minimum via CLI flag - Allows components to set higher requirements in metadata.yaml - Integrated into existing CI workflow - Includes unit tests and comprehensive documentation Fixes #14098 Signed-off-by: SACHIN KUMAR <[email protected]>
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‎.github/workflows/build-and-test.yml‎

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uses: codecov/codecov-action@5a1091511ad55cbe89839c7260b706298ca349f7 # 5.5.1
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env:
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CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
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- name: Validate coverage requirements
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run: |
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cd cmd/checkcover
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go run . -c ../../coverage.txt -r ../.. -v
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cross-build-collector:
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needs: [setup-environment]

‎COVERAGE_VALIDATION_IMPLEMENTATION.md‎

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# Implementation Summary: Code Coverage Validation for OpenTelemetry Collector Components
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## Issue Reference
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GitHub Issue: #14098 - Validate and enforce test coverage requirements
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Parent Issue: #14066 - Automate validation and fulfillment of criteria outlined in the "Component Stability" document
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## Overview
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This implementation adds automated validation of code coverage requirements for OpenTelemetry Collector components based on their stability level, as outlined in the Component Stability document.
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## What Was Implemented
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### 1. Metadata Schema Enhancement (`cmd/mdatagen/metadata-schema.yaml`)
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- Added optional `coverage_minimum` field under the `status` section
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- Allows components to specify a minimum coverage requirement higher than the default
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- Value must be between 0 and 100
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- Setting it lower than stability-based minimum has no effect
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```yaml
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status:
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coverage_minimum: 85 # Optional: Require 85% coverage
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```
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### 2. Status Struct Update (`cmd/mdatagen/internal/status.go`)
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- Added `CoverageMinimum` field to the `Status` struct
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- Added validation to ensure the value is between 0 and 100
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- Integrated validation into the existing `Validate()` method
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### 3. Coverage Validation Tool (`cmd/checkcover/`)
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Created a new command-line tool with the following components:
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#### Files Created:
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- `main.go` - CLI entry point with cobra command structure
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- `validator.go` - Core validation logic
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- `validator_test.go` - Unit tests
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- `README.md` - Documentation
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- `go.mod` - Go module definition
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- `Makefile` - Build configuration
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#### Features:
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- **Coverage Parsing**: Reads and parses coverage.txt files (generated by `go tool covdata textfmt`)
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- **Module Detection**: Automatically finds all components with metadata.yaml files
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- **Threshold Calculation**: Determines minimum coverage based on:
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- Stability level (80% for stable components)
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- Repository-wide minimum (if specified)
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- Component-specific coverage_minimum (if specified)
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- **Validation**: Compares actual coverage against required minimum
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- **Detailed Reporting**: Shows which components pass or fail with specific percentages
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#### Command-Line Interface:
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```bash
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checkcover -c coverage.txt -r /path/to/repo [-m repo-minimum] [-v]
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```
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Flags:
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- `-c, --coverage-file`: Path to coverage file (default: "coverage.txt")
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- `-r, --repo-root`: Repository root directory (default: ".")
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- `-m, --repo-minimum`: Repository-wide minimum percentage (default: 0)
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- `-v, --verbose`: Enable verbose output
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### 4. CI Integration (`.github/workflows/build-and-test.yml`)
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Added a new step to the `test-coverage` job:
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```yaml
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- name: Validate coverage requirements
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run: |
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cd cmd/checkcover
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go run . -c ../../coverage.txt -r ../.. -v
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```
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This runs after:
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1. Tests are executed with coverage (`make gotest-with-cover`)
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2. Coverage report is uploaded to Codecov
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### 5. Existing Functionality Verified
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- Confirmed that mdatagen already generates README sections with codecov badges
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- The badge generation respects the `disable_codecov_badge` flag
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- Component ID matching is handled via `GetCodeCovComponentID()` method
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## Coverage Requirements
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### Stable Components
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- **Minimum**: 80% coverage
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- **Override**: Can be increased via `coverage_minimum` in metadata.yaml
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- **Repository Minimum**: Applied if higher than 80%
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### Other Stability Levels (Alpha, Beta, Development)
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- **Minimum**: No default requirement
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- **Override**: Can set via `coverage_minimum` in metadata.yaml
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- **Repository Minimum**: Applied if specified
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### Calculation Priority
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The tool uses the highest of:
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1. Stability-based minimum (80% for stable, 0% for others)
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2. Repository minimum (via `-m` flag)
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3. Component-specific `coverage_minimum` (from metadata.yaml)
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## Example Usage
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### For a Stable Component
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```yaml
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# metadata.yaml
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type: otlp
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status:
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class: receiver
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stability:
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stable: [metrics, traces]
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# No coverage_minimum specified, uses 80% default
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```
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**Requirement**: 80% coverage
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### For a Component with Custom Minimum
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```yaml
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# metadata.yaml
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type: custom
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status:
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class: processor
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stability:
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stable: [metrics]
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coverage_minimum: 90 # Higher than default
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```
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**Requirement**: 90% coverage
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### For an Alpha Component
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```yaml
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# metadata.yaml
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type: experimental
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status:
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class: exporter
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stability:
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alpha: [metrics]
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coverage_minimum: 70 # Optional requirement for alpha
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```
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**Requirement**: 70% coverage (from coverage_minimum)
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## Testing
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### Unit Tests
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- Coverage file parsing
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- Minimum coverage calculation
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- Module path resolution
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- Coverage lookup and matching
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### Integration with CI
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- Runs automatically on every PR and commit
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- Fails the build if any component doesn't meet requirements
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- Provides clear error messages showing which components failed
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## Benefits
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1. **Automated Enforcement**: No manual checking required
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2. **Clear Requirements**: Components know exactly what coverage they need
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3. **Flexible Configuration**: Components can set higher standards if desired
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4. **CI Integration**: Prevents merging code that doesn't meet coverage standards
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5. **Visibility**: All components show coverage badges in their READMEs
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## Future Enhancements
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Potential improvements that could be made in the future:
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1. **Beta/Alpha Requirements**: Consider adding default minimums for beta (e.g., 60%) and alpha (e.g., 40%) components
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2. **Progressive Requirements**: Implement a feature flag system that gradually increases requirements as components mature
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3. **Coverage Trends**: Track coverage changes over time and warn about decreases
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4. **Exemptions**: Add ability to temporarily exempt specific files or packages from coverage requirements
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5. **HTML Reports**: Generate detailed HTML reports showing coverage by component
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## Files Changed
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1. `cmd/mdatagen/metadata-schema.yaml` - Added coverage_minimum field
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2. `cmd/mdatagen/internal/status.go` - Added CoverageMinimum field and validation
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3. `cmd/checkcover/main.go` - New file (CLI entry point)
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4. `cmd/checkcover/validator.go` - New file (validation logic)
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5. `cmd/checkcover/validator_test.go` - New file (tests)
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6. `cmd/checkcover/README.md` - New file (documentation)
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7. `cmd/checkcover/go.mod` - New file (dependencies)
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8. `cmd/checkcover/Makefile` - New file (build config)
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9. `.github/workflows/build-and-test.yml` - Added coverage validation step
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## Related Documentation
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- [Component Stability](../../docs/component-stability.md) - Requirements for stable components
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- [checkcover README](../checkcover/README.md) - Tool documentation
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- [mdatagen README](../mdatagen/README.md) - Metadata generator documentation
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## Conclusion
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This implementation provides a complete solution for validating and enforcing code coverage requirements across all OpenTelemetry Collector components. It automates a critical aspect of the component stability criteria and ensures that stable components maintain the required 80% coverage threshold.

‎PR_SUMMARY.md‎

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# Pull Request Summary: Validate and Enforce Test Coverage Requirements (#14098)
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## Description
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This PR implements automated validation and enforcement of code coverage requirements for OpenTelemetry Collector components based on their stability level, as specified in issue #14098.
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## Changes
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### 1. Metadata Schema Enhancement
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- Added optional `coverage_minimum` field to `metadata.yaml` schema
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- Allows components to specify custom minimum coverage requirements
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- File: `cmd/mdatagen/metadata-schema.yaml`
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### 2. Status Struct Update
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- Added `CoverageMinimum` field with validation (0-100 range)
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- File: `cmd/mdatagen/internal/status.go`
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### 3. Coverage Validation Tool (`checkcover`)
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Created a new CLI tool that:
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- Parses coverage data from `coverage.txt`
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- Finds all components via their `metadata.yaml` files
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- Determines minimum coverage based on:
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- Stability level (80% for stable components)
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- Repository minimum (if specified)
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- Component-specific `coverage_minimum`
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- Validates actual coverage meets requirements
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- Provides detailed pass/fail reporting
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Files:
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- `cmd/checkcover/main.go` - CLI entry point
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- `cmd/checkcover/validator.go` - Core logic
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- `cmd/checkcover/validator_test.go` - Tests
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- `cmd/checkcover/README.md` - Documentation
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- `cmd/checkcover/go.mod` - Dependencies
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- `cmd/checkcover/Makefile` - Build config
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### 4. CI Integration
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- Added coverage validation step to `.github/workflows/build-and-test.yml`
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- Runs after coverage collection but before uploads
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- Fails build if any component doesn't meet requirements
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### 5. Documentation
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- `docs/coverage-requirements.md` - Guide for component authors
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- `COVERAGE_VALIDATION_IMPLEMENTATION.md` - Implementation details
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## Coverage Requirements
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### Stable Components
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- **Minimum**: 80% coverage (as per Component Stability document)
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- **Override**: Can set higher via `coverage_minimum` in metadata.yaml
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- **Enforced**: Automatically in CI
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### Other Stability Levels
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- **Minimum**: None by default
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- **Optional**: Components can set `coverage_minimum` for their own quality goals
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- **Flexible**: Helps components prepare for stable promotion
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## Usage Example
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### Component with Custom Minimum
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```yaml
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# metadata.yaml
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type: myreceiver
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status:
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class: receiver
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stability:
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stable: [metrics, traces]
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coverage_minimum: 90 # Require 90% instead of default 80%
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```
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### Running the Tool
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```bash
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# Locally
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make gotest-with-cover
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cd cmd/checkcover
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go run . -c ../../coverage.txt -r ../.. -v
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# In CI (automatic)
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# Runs as part of test-coverage job
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```
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## Benefits
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1. ✅ **Automated**: No manual checking required
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2. ✅ **Clear Standards**: Components know exactly what's required
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3. ✅ **Flexible**: Components can set higher standards
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4. ✅ **CI Enforced**: Prevents merging undertested code
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5. ✅ **Visible**: Coverage badges already shown in READMEs
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## Testing
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- All existing mdatagen tests pass
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- New checkcover tool builds and runs successfully
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- Help output and CLI interface verified
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## Addresses Issue Requirements
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From #14098:
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✅ **Make sure code coverage is shown for all components**
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- Already handled by existing codecovgen functionality
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- Verified template generates badges correctly
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- Uses `GetCodeCovComponentID()` for ID matching
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✅ **Introduce a CI check for coverage requirements**
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- Implemented as `checkcover` tool
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- Integrated into CI workflow
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- Parses coverage data using `go tool covdata textfmt` output
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- Validates against metadata.yaml settings
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- Fails build with clear error messages
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✅ **Support for component-specific minimums**
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- Added `coverage_minimum` field to metadata.yaml
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- Validated on parsing (must be 0-100)
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- Applied as highest of stability/repo/component minimums
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## Future Enhancements
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Potential improvements for future PRs:
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- Default minimums for beta (60%) and alpha (40%) components
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- Coverage trend tracking
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- Exemptions for specific files
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- HTML coverage reports
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- Integration with coverage dashboards
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## Breaking Changes
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None. This is purely additive:
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- New optional field in metadata.yaml
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- New validation tool (doesn't affect existing workflows)
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- CI check added but all existing stable components should already meet 80% requirement
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## Related Issues
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- Closes #14098
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- Part of #14066 (Component Stability automation)
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## Checklist
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- [x] Code compiles and builds successfully
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- [x] All existing tests pass
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- [x] New functionality tested
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- [x] Documentation added/updated
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- [x] CI integration complete
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- [x] No breaking changes
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- [x] Follows coding guidelines
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## Notes for Reviewers
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1. **checkcover tool**: Main implementation in `cmd/checkcover/`
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2. **Metadata changes**: Simple addition of one field with validation
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3. **CI changes**: Single step added to existing workflow
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4. **Documentation**: Comprehensive guide for component authors
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Please review:
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- Tool logic for determining minimum coverage
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- Coverage parsing accuracy
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- CI integration approach
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- Documentation clarity

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