Blog

Posts tagged “Deploys”

Deploy markers name the guilty release: p95 per endpoint before and after a deploy, with /v1/search flagged as a regression

Deploy markers: tying a latency regression to the release that caused it

p95 doubled, and there were three deploys and a flag flip since yesterday. Deploy markers and a version field on every log line turn "which release did this" into a five-minute query. Here is how to set both up for a Node API.

Jason Fill October 13, 2026 6 min read

Node.js graceful shutdown, done right. Cover graphic for a guide to draining requests on SIGTERM in Express and Fastify.

Coding

Node.js graceful shutdown: stop dropping requests on every deploy

A burst of 502s on every deploy is usually the old process dying with requests in flight. Here is the shutdown order and Express and Fastify code that fixes it in an afternoon.

Jason Fill December 29, 2025 6 min read