One small part per post: a probe, a daily job, a trick, a trap that cost an afternoon.
An older MacBook does fine as an always-on machine for scheduled jobs and builds, if you stop it from sleeping, let it log itself in, and leave it alone. The handful of settings that matter and what to re-check after every macOS update.
A small company with no ops department, a dozen moving parts and a founder who used to fix servers at 3 am. What changed: one part-time DevOps engineer, working async, and a repo that is the only place work is handed over.
A fault gets noticed with your hands full and forgotten by the time you reach a desk. A tiny local web page takes a photo and one sentence and appends it to a markdown file, where it waits until somebody fixes it.
