When canary fails in the prepare stage, no notification is sent to Slack
This happened today: the pipeline https://ops.gitlab.net/gitlab-com/gl-infra/deployer/-/pipelines/234899 failed in the job gprd-cny-prepare
. But when it failed, no notification was sent to Slack. As a result, it took me a little while to realise the pipeline was not making any progress.
We should make sure that no matter what job in what stage fails, we announce this in Slack.