feat: add comprehensive cache statistics functionality for upstream zones #16
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…ones - Create new cache_stats module with VtsCacheStats and CacheStatsManager - Support all nginx cache statuses (HIT, MISS, BYPASS, EXPIRED, STALE, UPDATING, REVALIDATED, SCARCE) - Add cache size tracking with max/used size and utilization percentage - Implement Prometheus metrics formatting for cache statistics: - nginx_vts_cache_requests_total: cache requests by status - nginx_vts_cache_size_bytes: cache size statistics - nginx_vts_cache_hit_ratio: cache hit ratio percentage - Integrate cache metrics into VTS status output - Add comprehensive test coverage with 6 new cache-specific tests - All 48 tests pass with full clippy compliance and proper formatting Based on nginx-module-vts cache implementation patterns for compatibility. Enables cache monitoring for upstream zones as requested. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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Pull Request Overview
This PR adds comprehensive cache statistics functionality to the nginx-vts-rust module, enabling monitoring of cache performance and resource utilization across different cache zones.
- Implements cache status tracking for all 8 nginx cache states (HIT, MISS, BYPASS, EXPIRED, STALE, UPDATING, REVALIDATED, SCARCE)
- Adds cache size monitoring with utilization percentage calculation
- Integrates cache metrics into Prometheus output with proper labeling and formatting
Reviewed Changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
| src/cache_stats.rs | Implements core cache statistics data structures and management |
| src/lib.rs | Adds cache manager integration and public API functions |
| src/prometheus.rs | Extends Prometheus formatter with cache metrics support |
| test_cache_stats.rs | Provides comprehensive test coverage for cache functionality |
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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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Summary
Features
Metrics Added
nginx_vts_cache_requests_total{zone, status}: Cache requests by statusnginx_vts_cache_size_bytes{zone, type}: Cache size statistics (max/used)nginx_vts_cache_hit_ratio{zone}: Cache hit ratio percentageTest Plan
Based on nginx-module-vts implementation patterns for upstream compatibility.
Addresses the requirement for cache status functionality in upstream zones.
🤖 Generated with Claude Code