# Error Logging Implementation Status - December 2025

**Date:** 2025-12-16
**Original Plan:** Error logging system upgrade v0.1.23.5 → v0.2.0
**Implementation Status:** ~60% Complete

## What Was Planned

5-phase implementation over 15-17 hours:
- Phase 1: Event buffering foundation
- Phase 2: Agent event buffering integration
- Phase 3: Error integration (critical failures)
- Phase 4: Event reporting system
- Phase 5: UI integration (optional for v0.2.0)

## What's Been Implemented

✅ **Infrastructure (Phases 1-2):**
- Event buffer package: `aggregator-agent/internal/event/buffer.go` (135 lines)
- SystemEvent models in both agent and server
- Database schema: migration 019_create_system_events_table.sql
- Event buffering integration in migration paths

✅ **P0 Critical Error Points (Partial Phase 3):**
- Migration error reporting integrated
- Some agent failure points instrumented

❌ **Still Missing (Remaining Phase 3):**
- Agent startup failure event logging
- Registration failure event logging
- Token renewal failure event logging
- Complete scanner subsystem failure coverage

❌ **Event Reporting (Phase 4):**
- Agent check-in doesn't report buffered events
- Server doesn't process events from check-in payload
- No batch event reporting mechanism

❌ **UI Integration (Phase 5):**
- Not started (marked as optional for v0.2.0)

## Key Files

**Original Plan:** `docs/4_LOG/December_2025/2025-12-16_Error-Logging-Implementation-Plan.md`
**Agent Buffer:** `aggregator-agent/internal/event/buffer.go`
**Models:** `aggregator-agent/internal/models/system_event.go`
**Migration:** `aggregator-server/internal/database/migrations/019_create_system_events_table.up.sql`

## Technical Debt

- Event buffer exists but not integrated into all failure paths
- Server lacks event processing in agent check-in handler
- Missing unit tests for event buffering under failure conditions
- No performance benchmarks for high-volume event scenarios

## Next Steps

For v0.2.0 release:
1. Integrate event logging into agent startup/registration paths
2. Add server-side event processing in agent check-in
3. Test event buffering under network failures
4. Document event schema for future extensions

Post-v0.2.0:
- Implement UI event dashboard (Phase 5)
- Add event retention policies
- Create event analytics system