Phase 5: Observability & Production Readiness

[avirtuos]

Phase 5: Observability & Testing (Week 12)

Overview

Add production-grade monitoring, comprehensive test coverage, and operational tooling to ensure WormFS is ready for production deployment with full observability.

Timeline: Week 12 (5 working days)
Goal: Achieve production readiness with complete observability and testing

Success Metrics

• ✅ >95% metrics coverage of critical paths
• ✅ <10ms health endpoint latency
• ✅ 100% critical path test coverage
• ✅ All performance baselines documented
• ✅ Complete operational documentation
• ✅ Grafana dashboards for all components

High-Level Architecture

Observability Stack

┌─────────────────────────────────────────────┐
│            MetricService                    │
├─────────────────────────────────────────────┤
│  ┌──────────────────────────────────────┐  │
│  │      Metrics Collection              │  │
│  │  - Lock-free counters & gauges       │  │
│  │  - Histogram aggregation             │  │
│  └──────────────────────────────────────┘  │
│  ┌──────────────────────────────────────┐  │
│  │      Health Endpoints                │  │
│  │  - /health/live                      │  │
│  │  - /health/ready                     │  │
│  │  - /metrics (Prometheus)             │  │
│  └──────────────────────────────────────┘  │
└─────────────────────────────────────────────┘

┌─────────────────────────────────────────────┐
│         WormValidator Test Framework        │
├─────────────────────────────────────────────┤
│  - Cluster bootstrapping                    │
│  - FUSE client simulation                   │
│  - Chaos testing scenarios                  │
│  - Performance benchmarking                 │
└─────────────────────────────────────────────┘

Implementation Steps

Tasks

• Step 1: Implement MetricService (Days 1-2)
• Step 2: Create WormValidator Test Framework (Days 3-4)
• Step 3: Production Deployment Preparation (Day 5)

Key Metrics to Track

System Metrics

• Raft: proposals, elections, log size, commit latency
• FileStore: chunk read/write counts, latency, throughput
• MetadataStore: query latency, transaction duration
• Network: bandwidth, connections, message rates
• Watchdog: check duration, repair success rate

Business Metrics

• Files created/deleted per second
• Total storage utilization
• Erasure coding efficiency
• Recovery time objectives (RTO)
• Recovery point objectives (RPO)

Testing Scenarios

WormValidator Tests

1. Basic Operations: CRUD operations, directory management
2. Large Files: 100MB+ file transfers
3. Node Failures: Kill nodes during operations
4. Network Partitions: Simulate split-brain scenarios
5. Chaos Testing: Random failures and recoveries
6. Performance: Throughput and latency benchmarks

Dependencies

• prometheus - Metrics format
• axum - HTTP server for endpoints
• criterion - Performance benchmarking
• tempfile - Test cluster creation

Related Documentation

• Phase 5 Detailed Plan
• MetricService Design
• WormValidator Design
• Production Deployment Guide

Acceptance Criteria

• All metrics exposed via Prometheus endpoint
• Health checks respond correctly
• Test framework validates all scenarios
• Performance baselines established
• Grafana dashboards created
• Operational runbooks complete

Priority: High
Milestone: v1.0.0 - Production Ready