Covers 6 areas based on CockroachDB/Ceph/etcd/Longhorn research:
1. Structured logging: zap + JSON + channel model (OPS/STORAGE/REPL/ISCSI/AUDIT/HEALTH)
2. Distributed tracing: OpenTelemetry spans across write/rebuild/failover paths
3. Metrics: 40+ must-have Prometheus metrics with histogram latency buckets
4. Debug tools: debug zip (logs+pprof+state), log merge, live tail
5. Audit logging: every admin mutation with actor/target/operation/result
6. Alert design: 3 tiers (page/ticket/log), anti-patterns to avoid
Identifies existing gaps: no I/O latency histogram, no rebuild duration
metric, no audit trail, no structured logging, no distributed tracing.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
