Add comprehensive metrics system to HAL #1

dansimau · 2025-07-21T09:11:34Z

Summary

Implemented complete metrics collection system with SQLite storage and batched writes for performance
Added instrumentation for automation triggers, evaluations, and tick processing times
Created HAL CLI with stats command showing metrics across multiple time periods
Added automatic metric pruning to prevent database growth

Key Features

Optimized Storage: Batched writes every second, 30-day retention with automatic pruning
Comprehensive Instrumentation: Tracks automation triggers, evaluations, and processing times
Multi-period Analytics: Shows metrics for last minute/hour/day/month with appropriate aggregation
CLI Integration: New hal stats command with tabular output
Test Isolation: In-memory databases prevent test conflicts

Test plan

All existing tests pass with new metrics collection
CLI builds and runs correctly showing expected output format
Metrics service starts/stops properly with HAL lifecycle
Database migrations work correctly with new Metric table
Batching and pruning functionality verified

🤖 Generated with Claude Code

Note

Introduce SQLite-backed metrics (automation triggers, tick processing time) with pruning and a new hal stats CLI to display multi-period summaries.

Metrics Backend:
- Add store.Metric model and MetricType enums; migrate via store.Open.
- Implement metrics.Service for recording counters/timers and periodic pruning.
HAL Instrumentation:
- Wire metrics service into Connection lifecycle (Start/Stop).
- Record tick_processing_time (timer) and automation_triggered (counter) in StateChangeEvent.
CLI:
- New hal binary with stats command to show metrics for last minute/hour/day/month.
- Aggregation: sums for counters; p99 for timer metrics; tabular output.
Tests:
- Add unit/integration tests for metrics service, connection instrumentation, and CLI stats output.
Misc:
- Update .gitignore; add Cobra dependencies in go.mod.

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hal

metrics/service.go

store/models.go

dansimau

Looks good but can we:

Use a popular Golang library for the CLI
Add tests for everything here

- Added SQLite metrics storage with optimized batched writes and automatic pruning - Implemented metrics service with configurable retention (30 days default) - Added instrumentation for: * Automation triggered events * Automation evaluation events * Tick processing time measurements - Created HAL CLI with stat command showing metrics across time periods: * Last minute, hour, day, month * Counter metrics summed, timer metrics show p99 - Added database path configuration support for flexible deployment - Fixed test isolation with in-memory databases 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>

## Cobra CLI Integration - Replaced basic CLI with professional Cobra library - Added proper command structure, help text, and flags - Supports aliases and examples for better UX - Added --db flag for custom database paths ## Comprehensive Test Suite - Added metrics service tests (async and sync scenarios) - Added CLI stats command tests with sample data - Added connection metrics integration tests - Tests cover batching, pruning, error handling, and edge cases - Fixed database concurrency issues in tests ## Metrics System Enhancements - Fixed service shutdown to properly drain buffered metrics - Improved async processing reliability - Better error handling and logging All major functionality now has test coverage ensuring reliability. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>

## Line-by-line feedback addressed: ### 1. Remove hal binary and add to .gitignore ✅ - Removed committed hal binary - Added hal to .gitignore to prevent future commits ### 2. Simplify metrics system (remove complex batching) ✅ - Removed complex buffering and batching system - Now writes directly to SQLite, leveraging WAL mode for performance - Eliminates risk of data loss if process dies - Much simpler and more reliable implementation ### 3. Extend retention from 30 days to 3 months ✅ - Changed retention from 30 days to 90 days (3 months) - Updated tests to reflect new retention period ### 4. Make MetricType a custom type instead of string ✅ - Created custom MetricType type for type safety - Updated all usage throughout codebase - Prevents string-based errors and improves API clarity ### 5. Updated tests for simplified service ✅ - Removed tests for complex batching behavior - Updated all tests to work with direct SQLite writes - All metrics tests now pass The metrics system is now simpler, more reliable, and addresses all the specific concerns raised in the PR review. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>