HOW SLACK AUTOMATES DEPLOYS

Summary from the TLDR Web Dev newsletter

Slack automated deployments with a program called ReleaseBot. ReleaseBot monitors deployments, detects anomalies using z-scores and dynamic thresholds, and can pause or roll back deployments if necessary. This proved to be a big improvement compared to Slack’s previous process, which involved engineers serving as “Deployment Commanders” that oversaw manual deploys.