* …
=== Action API changes in 1.33 ===
+* (T198913) Added 'ApiOptions' hook.
* …
=== Action API internal changes in 1.33 ===
* …
=== Deprecations in 1.33 ===
+* The configuration option $wgUseESI has been deprecated, and is expected
+ to be removed in a future release.
* …
=== Other changes in 1.33 ===