.sleuth/rules.yml, and include zero or more conditions, as well as one or more actions to take when those conditions are met. Rules are triggered by events such as a code deployment or a deploy being determined to be healthy.
stage-to-prodin this example, and can have a description to display in the Sleuth interface. The actions used here automatically approve a pending build and then send a notification to the Slack deployment message thread. Another common action is webhook, used to notify external systems.