read-only Friday
expressionops culture
The ops tradition of making no production changes on Friday, because weekends exist.
A deploy at five on Friday has a way of becoming a Saturday incident with half the team unreachable. Mature CI/CD teams argue the rule away - if deploys are that risky, fix the deploys - but the instinct it encodes is respect for blast radius and for people's time off.
Also known as: no-deploy Friday