https://engineering-notes.com/ Notes on backend systems, observability and distributed tracing. en Sun, 07 Jun 2026 11:06:47 GMT https://engineering-notes.com/posts/connection-pool-sizing-go.html https://engineering-notes.com/posts/connection-pool-sizing-go.html Tue, 02 Jun 2026 12:00:00 GMT Last quarter I spent a frustrating week chasing a latency regression in one of our payment routing services. The p99 grew from 12ms to 80ms after we doubled traffic, but CPU was idle and the database itself was bored. The culprit was a misconfigured pgxpool that I had inherited a https://engineering-notes.com/posts/grpc-streaming-backpressure.html https://engineering-notes.com/posts/grpc-streaming-backpressure.html Sat, 14 Mar 2026 12:00:00 GMT HTTP/2 flow control plus a pull-based control channel to make consumer rate observable on the server. https://engineering-notes.com/posts/postgres-pgbouncer-pooling-modes.html https://engineering-notes.com/posts/postgres-pgbouncer-pooling-modes.html Sun, 22 Feb 2026 12:00:00 GMT Session, transaction and statement pooling each break a different subset of postgres features. https://engineering-notes.com/posts/otel-collector-tail-sampling.html https://engineering-notes.com/posts/otel-collector-tail-sampling.html Fri, 30 Jan 2026 12:00:00 GMT Moving the sampling decision from the SDK to the collector to keep what matters. https://engineering-notes.com/posts/kafka-rebalance-static-membership.html https://engineering-notes.com/posts/kafka-rebalance-static-membership.html Fri, 12 Dec 2025 12:00:00 GMT KIP-345 cut our rolling-deploy rebalance from two minutes to under five seconds.