Warning first, retirement later
Deprecation tells people to stop adopting a feature or version and plan to move away from it. It may keep working during a transition period. At end of life (EOL), the provider ends support. That may mean no more updates or security fixes; the feature may also stop working.
Help users move
Teams should explain who is affected, why the change is happening, what to use instead, and when support ends. They should allow time to switch and track progress. The notice period should reflect the effort to migrate, customer impact, contractual commitments, and security risk.