# Observability
All Observability notes →7 — Metrics Storage (TSDB)
Chunk/block encoding, the write-ahead log, compaction and the write amplification it trades for query speed, and why a cardinality spike is a storage-engine problem, not just a cost line item.
observability storage query book
Jul 17, 2026
8 — Log Aggregation
Schema-on-write vs. schema-on-read as competing bets about when to pay indexing cost, and the two different deduplication problems a log pipeline actually has to solve.
observability storage query book
Jul 17, 2026
7 — Distributed Tracing Backend
How spans that arrive out of order, from different services, get assembled into one trace — and the two competing storage models (indexed search vs. object storage plus a trace-ID lookup) that trade query flexibility for cost.
observability storage query book
Jul 17, 2026