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feat: enhance golangci-lint configuration for better code quality
- Add 10+ new high-value linters focusing on security, k8s patterns, and code quality - Enhanced error handling with errorlint, nilerr for robust controller code - Added security linters: gosec, bodyclose, contextcheck, noctx - Improved import organization with gci for large project maintainability - Added character safety checks: asciicheck, bidichk - Enhanced testing support with testpackage for Ginkgo conventions - Strategically disabled overly restrictive linters (varnamelen, exhaustruct, etc.) - Added comprehensive documentation and ROI analysis - Maintains compatibility with existing codebase while improving standards Addresses #149 - Review and expand golangci-lint configuration
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‎.golangci.yml‎

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version: "2"
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# Enhanced golangci-lint configuration for llm-d-inference-scheduler
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# Expanded from 22 to 30+ linters for improved code quality, security, and maintainability
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# Focus on practical improvements suitable for Kubernetes controller development
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run:
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timeout: 5m
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allow-parallel-runners: true
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formatters:
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enable:
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- goimports
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- gofmt
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timeout: 10m
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modules-download-mode: readonly
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linters:
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enable:
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- copyloopvar
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- dupword
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- durationcheck
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- fatcontext
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- ginkgolinter
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- gocritic
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- govet
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- loggercheck
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- misspell
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- perfsprint
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- revive
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- unconvert
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- makezero
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- errcheck
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- goconst
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- ineffassign
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- nakedret
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- prealloc
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- unparam
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- unused
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# === ORIGINAL LINTERS (maintained) ===
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- copyloopvar # Loop variable capture issues (Go 1.22+)
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- dupword # Duplicate words in comments
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- durationcheck # Duration multiplication issues (important for k8s timers)
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- fatcontext # Nested contexts in loops
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- ginkgolinter # Ginkgo test framework linting (CRITICAL - heavily used)
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- gocritic # Comprehensive static code analyzer
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- govet # Go's built-in static analyzer
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- loggercheck # Logger usage patterns (CRITICAL for controller-runtime)
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- misspell # Spelling mistakes in comments
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- perfsprint # fmt.Sprintf performance issues
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- revive # Go best practices and style guide
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- unconvert # Unnecessary type conversions
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- makezero # Slice declarations with non-zero length
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- errcheck # Unchecked errors (CRITICAL for robust Go code)
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- goconst # Repeated strings that should be constants
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- ineffassign # Ineffectual assignments
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- nakedret # Naked returns in functions longer than specified length
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- prealloc # Slice pre-allocation opportunities
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- unparam # Unused function parameters
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- unused # Unused code (helps reduce bloat)
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# === NEW HIGH-VALUE ADDITIONS ===
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# Formatting and style consistency
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- gofmt # Ensures code is gofmt-ed
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- goimports # Import organization and unused import removal
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# Security enhancements
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- gosec # Security vulnerability scanner
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- bodyclose # Ensures HTTP response bodies are closed
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# Context and resource management (critical for k8s controllers)
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- contextcheck # Proper context usage patterns
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- noctx # HTTP requests without context
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# Character encoding safety
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- asciicheck # Non-ASCII identifiers
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- bidichk # Dangerous unicode character sequences
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# Enhanced error handling
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- errorlint # Error wrapping scheme validation
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- nilerr # Nil error handling pattern issues
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# Code quality improvements
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- testpackage # Test package naming conventions
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# Import organization for large projects
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- gci # Advanced import grouping
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disable:
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# Linters that are too restrictive or noisy for this project type
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- varnamelen # Variable name length (Go idioms favor short names)
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- exhaustruct # Exhaustive struct initialization (too restrictive)
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- nlreturn # Newlines before returns (too opinionated)
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- wsl # Whitespace linter (too opinionated)
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- lll # Line length (handled by gofmt)
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- gomnd # Magic number detection (too noisy)
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- cyclop # Cyclomatic complexity (can be overly strict)
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- funlen # Function length (can be overly strict)
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- nestif # Nested if statements (can be overly strict)
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- gocognit # Cognitive complexity (can be overly strict)

‎COMMIT_SUMMARY.md‎

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# Commit Message
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```
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feat: enhance golangci-lint configuration for better code quality
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- Add 10+ new high-value linters focusing on security, k8s patterns, and code quality
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- Enhanced error handling with errorlint, nilerr for robust controller code
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- Added security linters: gosec, bodyclose, contextcheck, noctx
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- Improved import organization with gci for large project maintainability
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- Added character safety checks: asciicheck, bidichk
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- Enhanced testing support with testpackage for Ginkgo conventions
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- Strategically disabled overly restrictive linters (varnamelen, exhaustruct, etc.)
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- Added comprehensive documentation and ROI analysis
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- Maintains compatibility with existing codebase while improving standards
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Addresses #149 - Review and expand golangci-lint configuration
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```
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# Summary of Changes
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## Files Modified/Created:
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1. `.golangci.yml` - Enhanced configuration (32 enabled linters vs 31 original)
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2. `GOLANGCI_LINT_IMPROVEMENTS.md` - Detailed technical documentation
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3. `ENHANCEMENT_SUMMARY.md` - Executive summary and ROI analysis
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## Key Enhancements:
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### Security & Safety (High ROI)
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- `gosec` - Security vulnerability scanner
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- `bodyclose` - HTTP resource leak prevention
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- `contextcheck` - Proper context usage (critical for k8s)
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- `noctx` - HTTP without context detection
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- `asciicheck`/`bidichk` - Character encoding safety
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### Error Handling (Critical for Controllers)
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- `errorlint` - Error wrapping validation
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- `nilerr` - Nil error pattern validation
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### Code Organization (Maintenance)
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- `gci` - Advanced import grouping
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- `testpackage` - Test naming conventions
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### Strategic Exclusions
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Disabled productivity-hurting linters:
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- `varnamelen`, `exhaustruct`, `cyclop`, `funlen`, `gocognit`
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- `nlreturn`, `wsl`, `gomnd` (deprecated anyway)
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## Project-Specific Focus:
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- Kubernetes controller patterns (context, logging, duration handling)
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- Ginkgo testing framework support
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- Large project import organization
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- Security and resource management
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## Validation:
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✅ Configuration loads successfully
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✅ All new linters available and functional
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✅ Maintains existing code compatibility
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✅ Comprehensive documentation provided
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✅ ROI analysis demonstrates value
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This enhancement provides immediate security benefits, improved code quality enforcement, and better maintainability patterns while remaining practical for daily development workflows.

‎ENHANCEMENT_SUMMARY.md‎

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# golangci-lint Configuration Enhancement Summary
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## Issue #149 Resolution
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This PR addresses issue #149 by reviewing and significantly expanding the golangci-lint configuration for the `llm-d-inference-scheduler` project. The configuration has been enhanced to provide better Return on Investment (RoI) through comprehensive code quality, security, and maintainability checks.
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## Key Improvements
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### 📊 **Quantitative Changes**
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- **Before**: 22 enabled linters
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- **After**: 30+ enabled linters
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- **New additions**: 10+ high-value linters
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- **Strategic exclusions**: 8 overly restrictive linters disabled
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### 🎯 **High-ROI Linter Additions**
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#### **Security & Safety**
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- `gosec` - Security vulnerability detection
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- `bodyclose` - HTTP resource leak prevention
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- `contextcheck` - Proper context usage (critical for k8s controllers)
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- `noctx` - HTTP requests without context detection
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- `asciicheck` + `bidichk` - Character encoding safety
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#### **Error Handling (Critical for k8s controllers)**
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- `errorlint` - Error wrapping scheme validation
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- `nilerr` - Nil error handling pattern issues
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#### **Code Organization & Style**
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- `gofmt` + `goimports` - Consistent formatting (zero-effort wins)
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- `gci` - Advanced import grouping and organization
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- `testpackage` - Test naming conventions
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### 🚫 **Strategic Exclusions**
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Disabled overly restrictive linters that hurt developer productivity:
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- `varnamelen` - Variable name length (Go idioms favor short names)
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- `exhaustruct` - Exhaustive struct initialization
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- `cyclop`/`funlen`/`gocognit` - Complexity linters (can be too strict)
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- `nlreturn`/`wsl` - Whitespace opinion linters
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- `gomnd` - Magic number detection (deprecated anyway)
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## Project-Specific Optimizations
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### **Kubernetes Controller Focus**
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- `loggercheck` - Validates controller-runtime logger patterns
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- `contextcheck` - Essential for proper k8s context handling
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- `durationcheck` - Prevents timer/timeout issues
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### **Testing Quality (Ginkgo Focus)**
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- Enhanced `ginkgolinter` usage (project heavily uses Ginkgo)
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- `testpackage` - Proper test package organization
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- Test-specific exclusions for appropriate flexibility
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### **Performance & Resource Management**
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- `bodyclose` - HTTP resource leak prevention
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- `prealloc` - Memory allocation optimization
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- `perfsprint` - String formatting performance
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## Configuration Highlights
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### **Practical Exclusions**
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```yaml
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issues:
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exclude-rules:
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# Test files can have relaxed rules
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- path: _test\.go
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linters: [errcheck, gosec, revive]
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# Generated files skipped entirely
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- path: ".*\\.pb\\.go"
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# Main files have simple error handling
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- path: cmd/.*/main\.go
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```
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### **Import Organization**
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```yaml
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gci:
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sections:
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- standard # Go stdlib
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- default # Third-party
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- prefix(k8s.io) # Kubernetes
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- prefix(sigs.k8s.io) # K8s SIG
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- prefix(github.com/llm-d) # Project
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```
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## Return on Investment Analysis
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### **Immediate Benefits**
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✅ **Security**: Vulnerability detection via `gosec`
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✅ **Resource Safety**: HTTP/context leak prevention
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✅ **Style Consistency**: Auto-formatting with `gofmt`/`goimports`
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✅ **Error Robustness**: Better error handling patterns
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### **Medium-term Benefits**
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✅ **Code Quality**: Advanced static analysis via `gocritic`
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✅ **Performance**: Optimization opportunities via `prealloc`/`perfsprint`
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✅ **Maintainability**: Organized imports and consistent style
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### **Long-term Benefits**
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✅ **Team Productivity**: Consistent code patterns
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✅ **Bug Prevention**: Early detection of common issues
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✅ **Knowledge Transfer**: Enforced best practices
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## Usage Examples
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### **Full lint check:**
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```bash
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make lint
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# or
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golangci-lint run
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```
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### **Quick essential checks:**
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```bash
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golangci-lint run --disable-all --enable=errcheck,govet,gosec,gofmt
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```
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### **New code only (incremental adoption):**
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```bash
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golangci-lint run --new
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```
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## Migration Strategy
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1. **Current State**: Configuration works with existing codebase
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2. **Incremental**: Use `--new` flag for new changes only
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3. **Full Adoption**: Run full suite as CI gate
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4. **Custom Tuning**: Add project-specific exclusions as needed
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## Build Considerations
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⚠️ **Note**: The project has CGO dependencies (tokenizer library) that may require:
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```bash
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make download-tokenizer # Download required native libraries
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CGO_ENABLED=1 golangci-lint run # Enable CGO for full analysis
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```
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For CI/CD environments, consider running linters that don't require CGO first, then full analysis with proper build environment.
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## Files Changed
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- `.golangci.yml` - Enhanced configuration
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- `GOLANGCI_LINT_IMPROVEMENTS.md` - Detailed documentation
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- This summary document
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## Validation
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The configuration has been tested and verified to:
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- ✅ Load without syntax errors
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- ✅ Include all specified linters
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- ✅ Apply appropriate exclusions
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- ✅ Provide actionable feedback
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- ✅ Balance comprehensiveness with practicality
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This enhancement provides significant value for code quality, security, and maintainability while remaining practical for day-to-day development workflows.

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