Issue #3439369 by fromme, quietone, pradhumanjain2311, smustgrave, alexpott: Remove deprecated code in migration system

Issue #3261653 by Spokje, catch, larowlan, quietone, kim.pepper, smustgrave, andypost, lauriii: Remove Forum module

Issue #3261452 by Spokje, andypost, naveenvalecha, quietone, smustgrave: [11.x] Remove tracker module from core

Issue #3441718 by mondrake: Fix string array keys in data sets returned by data provider methods that do not match the parameter names in Unit tests

Issue #2827897 by quietone, danflanagan8, mikelutz, smustgrave, mikeryan, osopolar, xurizaemon, benjifisher: Update documentation for handling dots in the static_map plugin

Issue #3221516 by quietone, himanshu_jhaloya, smustgrave, Lendude, joachim: Improve documentation for $old_destination_id_values in MigrateDestinationInterface

Issue #3427564 by phenaproxima, Wim Leers, alexpott, omkar.podey, Berdir, smustgrave, larowlan: Require `langcode: …` only for simple config that contains translatable values

Issue #3426506 by kim.pepper, smustgrave, mstrelan, alexpott: Create enums for File exists options and deprecate consts

Issue #3421016 by quietone, godotislate: Convert MigrateProcessPlugin plugin discovery to attributes

Issue #3424509 by godotislate, quietone, sorlov, smustgrave, alexpott, benjifisher: Update MigratePluginManager to include both attribute and annotation class

Revert "Issue #3424509 by godotislate, quietone, sorlov, smustgrave, benjifisher, alexpott: Update MigratePluginManager to include both attribute and annotation class"

This reverts commit c9d53fd4.

Issue #3424509 by godotislate, quietone, sorlov, smustgrave, benjifisher, alexpott: Update MigratePluginManager to include both attribute and annotation class

Issue #3437129 by mikelutz: Remove Drupal\Tests\migrate\Kernel\MigrateSourceTestBase::providerSource()

Issue #3433089 by mondrake: Method onConsecutiveCalls() of class PHPUnit\Framework\TestCase is deprecated in PHPUnit 10

Issue #3432849 by mondrake, Spokje: Method returnSelf() of class PHPUnit\Framework\TestCase is deprecated in PHPUnit 10

Issue #3425337 by mondrake: Fix root namespace classes DebugClassLoader forward compatibility warnings

Revert "Issue #3425337 by mondrake: Fix root namespace classes DebugClassLoader forward compatibility warnings"

This reverts commit ea9cc753.

Issue #3425337 by mondrake: Fix root namespace classes DebugClassLoader forward compatibility warnings

Revert "Issue #3425337 by mondrake: Fix root namespace classes DebugClassLoader forward compatibility warnings"

This reverts commit ff7c5de3.

Issue #3425337 by mondrake: Fix root namespace classes DebugClassLoader forward compatibility warnings

Issue #3197915 by quietone, joachim, Tanuj., karishmaamin, dww:  Add details to MigrateSkipRowException messages caused by stub creation

Issue #3256524 by mondrake: [11.x] Adjust Database API to remove deprecated Drupal 10 code in Drupal 11

Issue #3422543 by mstrelan, smustgrave, longwave: Make use of is_iterable and is_countable functions