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Module reference
****************
+Deprecation schedule and versions
+---------------------------------
+Keys may be documented as ``deprecated``, ``new``, or ``changed``.
+This allows cloud-init to evolve as requirements change, and to adopt
+better practices without maintaining design decisions indefinitely.
+
+Keys that have been marked as deprecated or changed may be removed or
+changed 5 years from the date of deprecation. For example, a key that is
+deprecated in version ``22.1`` (which is the first release in 2022) is
+scheduled to be removed in ``27.1`` (first release in 2027). Use of
+deprecated keys may cause warnings in the logs. In the case that a
+key's expected value changes, the key will be marked ``changed`` with a
+date. A 5 year timeline may also be expected for changed keys.
+
+
.. automodule:: cloudinit.config.cc_ansible
.. automodule:: cloudinit.config.cc_apk_configure
.. automodule:: cloudinit.config.cc_apt_configure