feat(metrics): Add histogram metrics support for latency distributions#453
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Implement histogram metric class that supports: - Configurable bucket boundaries for value distribution tracking - Thread-safe atomic operations for concurrent recording - Percentile calculations (p50, p95, p99, p999) - Prometheus and JSON format export via snapshot - Linear interpolation for percentile estimation Addresses #409
Implement sliding window histogram that automatically expires old data: - Configurable time window duration and bucket count - Auto-expiring time buckets for recent-only percentile tracking - Aggregated statistics across all active time buckets - Useful for real-time performance monitoring Addresses #409
Add histogram-based metrics methods to metric_reporter: - record_latency/connection_time/request_duration for histogram recording - get_latency_p50/p95/p99 for percentile retrieval - get_all_histograms for bulk snapshot export - reset_histograms for clearing all histogram data New metric names added for histogram tracking: - network.latency.histogram - network.connection_time.histogram - network.request_duration.histogram Addresses #409
Add comprehensive test coverage including: - Histogram basic operations (record, count, sum, min/max) - Percentile calculations (p50, p95, p99) - Custom bucket boundaries - Prometheus and JSON export formats - Thread safety with concurrent reads and writes - Sliding histogram time windowing - metric_reporter histogram integration All 29 tests pass. Addresses #409
Add documentation for histogram metrics implementation (#409): - histogram and sliding_histogram classes - metric_reporter integration - Prometheus and JSON export formats - Comprehensive test coverage Updated both English and Korean CHANGELOGs.
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#453) * feat(metrics): add histogram class for latency distributions Implement histogram metric class that supports: - Configurable bucket boundaries for value distribution tracking - Thread-safe atomic operations for concurrent recording - Percentile calculations (p50, p95, p99, p999) - Prometheus and JSON format export via snapshot - Linear interpolation for percentile estimation Addresses #409 * feat(metrics): add sliding_histogram for time-windowed tracking Implement sliding window histogram that automatically expires old data: - Configurable time window duration and bucket count - Auto-expiring time buckets for recent-only percentile tracking - Aggregated statistics across all active time buckets - Useful for real-time performance monitoring Addresses #409 * feat(metrics): integrate histogram metrics with metric_reporter Add histogram-based metrics methods to metric_reporter: - record_latency/connection_time/request_duration for histogram recording - get_latency_p50/p95/p99 for percentile retrieval - get_all_histograms for bulk snapshot export - reset_histograms for clearing all histogram data New metric names added for histogram tracking: - network.latency.histogram - network.connection_time.histogram - network.request_duration.histogram Addresses #409 * test(metrics): add unit tests for histogram and sliding_histogram Add comprehensive test coverage including: - Histogram basic operations (record, count, sum, min/max) - Percentile calculations (p50, p95, p99) - Custom bucket boundaries - Prometheus and JSON export formats - Thread safety with concurrent reads and writes - Sliding histogram time windowing - metric_reporter histogram integration All 29 tests pass. Addresses #409 * docs: update CHANGELOG with histogram metrics feature Add documentation for histogram metrics implementation (#409): - histogram and sliding_histogram classes - metric_reporter integration - Prometheus and JSON export formats - Comprehensive test coverage Updated both English and Korean CHANGELOGs.
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Summary
histogramclass for capturing value distributions with configurable bucket boundariessliding_histogramclass for time-windowed percentile tracking (auto-expiring old data)metric_reporterfor seamless usageChanges
New Files
include/kcenon/network/metrics/histogram.h- Histogram class with percentile calculationsinclude/kcenon/network/metrics/sliding_histogram.h- Time-windowed histogramsrc/metrics/histogram.cpp- Histogram implementationsrc/metrics/sliding_histogram.cpp- Sliding histogram implementationtests/unit/test_histogram.cpp- Comprehensive unit tests (29 tests)Modified Files
include/kcenon/network/metrics/network_metrics.h- Added histogram methods to metric_reportersrc/metrics/network_metrics.cpp- Implemented histogram integrationCMakeLists.txt- Added new source filestests/CMakeLists.txt- Added histogram test targetdocs/CHANGELOG.md- Documented new featuredocs/CHANGELOG_KO.md- Korean changelog updateFeatures
histogram class
sliding_histogram class
metric_reporter integration
record_latency(),record_connection_time(),record_request_duration()get_latency_p50(),get_latency_p95(),get_latency_p99()get_all_histograms()for bulk exportreset_histograms()for clearing dataTest plan
Closes #409