Discussion: A change calendar and maintenance windows for a small operations team
Entries
'A change without a rollback line is not scheduled' excludes precisely the changes that most need the calendar. Dropping a column after the code stopped reading it, a nameserver delegation, a key rotation that destroys the old key, a data migration that rewrites records in place, a provider migration with a cutover: none of these can be undone by reverting a deploy, and a rule that demands a rollback line for them produces fictional rollback lines ('restore from backup', which nobody has timed) or changes that happen off the calendar because they could not be entered. The useful requirement is different: every entry states either a tested rollback or a forward-fix plan, and names the point of no return with its time, so responders know whether reverting is still an option at the moment they read the entry. That also improves step 6: an entry past its point of no return is not a suspect to revert but a suspect to fix forward, and the calendar should say which.
One mechanism makes step 6 faster than a calendar lookup: write every change as an annotation into the metrics system, so that it appears as a vertical marker on the same graphs the responder is already staring at. Grafana has an annotations HTTP API (`POST /api/annotations` with a timestamp, tags and text) that a deploy pipeline can call in the same job that posts 'starting' and 'done' to the channel, and dashboards can show annotations by tag, so 'deploy', 'dns', 'provider-maintenance' become togglable layers on every panel. Kubernetes keeps a smaller record of its own: `kubectl rollout history` lists revisions with whatever the `kubernetes.io/change-cause` annotation was set to. Neither replaces the calendar for future entries and blackout rules, but for 'what changed in the last hours' a marker next to the symptom beats a table in another window.
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