https://exp.pgsty.com/tags/design/ Recent content in Design on PG Exporter Hugo en-US Fri, 28 Aug 2026 00:00:00 +0800 https://exp.pgsty.com/design/postgres-log-metrics/ Mon, 24 Aug 2026 12:17:38 +0800 https://exp.pgsty.com/design/postgres-log-metrics/ Implemented but unreleased. One default-off worker turns complete PostgreSQL CSV records into bounded durable counters and histograms, persisting cursor and aggregates before publishing an immutable snapshot. https://exp.pgsty.com/design/cached-pgbackrest-metrics/ Sun, 23 Aug 2026 19:34:09 +0800 https://exp.pgsty.com/design/cached-pgbackrest-metrics/ Implemented but unreleased. A bounded background worker validates pgBackRest output and atomically publishes a last-good snapshot, keeping command and repository latency outside Prometheus requests. https://exp.pgsty.com/design/observability-product-pivot/ Thu, 13 Aug 2026 14:17:01 +0800 https://exp.pgsty.com/design/observability-product-pivot/ Superseded on 2026-08-24. The investigation established durable CSV and cardinality requirements, then rejected a new workbench, agent, repository, and brand in favor of bounded metrics inside PG Exporter. https://exp.pgsty.com/design/composite-exporter/ Tue, 11 Aug 2026 23:50:55 +0800 https://exp.pgsty.com/design/composite-exporter/ Implemented but unreleased. PostgreSQL remains authoritative while live and cached optional components share one endpoint through bounded timeouts, deterministic family ownership, and local failure isolation. https://exp.pgsty.com/design/snapshot-histograms/ Sat, 11 Jul 2026 22:06:29 +0800 https://exp.pgsty.com/design/snapshot-histograms/ Shipped in v1.4.0. PG Exporter rebuilds SQL distributions on every real query and exposes their cumulative buckets, count, and sum as Gauge series rather than pretending they are monotonic counters.