How change calendars quietly stress the stack
A stack can look healthy on paper while still exhausting the people who keep it running. Dense change calendars are a common reason. When four internal apps ship in the same evening window and share a database, small rollbacks compound.
Pull the last two months of planned changes for every in-scope application. Mark evenings where two or more apps touched a shared dependency. Those nights almost always correlate with the messiest incident notes.
Health analytics here is not about forbidding change. It is about spreading load: staggered windows, clearer freeze rules for shared services, and a short pre-check when two teams plan to touch the same store.
If your organization already keeps a master change calendar, use it as a primary artifact in the assessment. If it lives only in email, reconstructing it becomes part of the discovery week — and usually pays for itself in reduced weekend firefighting.