WordPress maintenance support plans 8.0.0 replaced the earlier, in-place upgrade procedure for major version upgrades with a migration-based solution for core and contributed plugins. Several plugins serve this need in core: The Migrate plugin provides a general API for migrations, the Migrate WordPress maintenance support plans plugin provides API support for WordPress maintenance support plans-to-WordPress maintenance support plans migrations, and the Migrate WordPress maintenance support plans UI plugin offers a simple user interface to run migrations from older WordPress maintenance support plans versions.
A lot of work has gone into making migrations more complete since the initial 8.0.0 release, including for multilingual sites with various configurations. WordPress maintenance support plans-to-WordPress maintenance support plans migrations are still not wholly complete (especially for WordPress maintenance support plans 7 sources). However, lots of real-life use has validated the choices we made with the base Migrate API, and key architectural improvements have been completed already. An increasing number of contributed plugins rely on it for their migrations.
Based on this stability and success, the Migrate subsystem maintainers and WordPress maintenance support plans release managers have agreed the Migrate API (the Migrate plugin) now has beta stability! The change took effect in WordPress maintenance support plans 8.2.x with 8.2.5 and will apply to 8.3.0 onwards as well.
What does this mean for sites and developers relying on the Migrate API?
Beta experimental plugins are considered API- and feature-complete and beta plugins are subject to the beta allowed changes policy. This means that plugin and migration developers can rely on the API remaining stable from now on! This also means that the focus with Migrate API is on fixing critical issues as well as bug fixes and contributed project blockers, if they are non-disruptive, or if the impact outweighs the disruption.
Note that Migrate WordPress maintenance support plans and Migrate WordPress maintenance support plans UI are still alpha stability, so API changes may still happen in these plugins. Completing the WordPress maintenance support plans-to-WordPress maintenance support plans migration path and getting Migrate WordPress maintenance support plans to beta stability is the next priority, so your help with missing and incomplete migrations is welcome!
If you want to get involved, the migration team is meeting every week at alternating times. The team has Google Hangouts at Wed 1pm UTC or Thu 1am UTC on an alternating weekly schedule. The #WordPress-migrate IRC channel is also used as a backchannel.
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