Issue #3442713 by smustgrave, catch, Binoli Lalani, longwave: Remove deprecated code from the entity system

Issue #3418298 by Akhil Babu, Kanchan Bhogade: Improve the exception message when an entity form class does not exist

Issue #3419909 by longwave, Spokje: Explicitly inject the container into ClassResolver and EntityTypeManager

Issue #2820411 by Akhil Babu, smustgrave, larowlan, joachim, quietone: Improve the exception message when an entity handler class does not exist

Issue #2616814 by dpi, Xano, geek-merlin, Hardik_Patel_12, jofitz, alexpott, Fabianx, catch, joachim, andypost, dawehner, daffie, cweagans, neclimdul: Delegate all hook invocations to ModuleHandler

Issue #3222251 by bbrala, longwave: [November 8, 2021] Replace all isset constructs with the null coalescing operator

Issue #3131585 by Berdir, alexpott, daffie: Performance regression caused by using the last installed entity definitions

Issue #3052233 by mikelutz, Berdir, alexpott: Properly deprecate EntityFormInterface::setEntityManager() and trigger an error on use

Issue #3047866 by mikelutz, Berdir, TR, alexpott, andypost, Satyanarayan Reddy: Remove usage of deprecated \Drupal::entityManager() in core

Issue #2554235 by amateescu, plach, Berdir, Sam152, joelpittet, mbaynton, catch, jibran: Make the content entity storage and entity query use the last installed definitions instead of the ones living in code

Issue #2902412 by Jo Fitzgerald, andypost, mfernea, andriyun: Fix 'Drupal.Strings.UnnecessaryStringConcat' coding standard

Issue #1596472 by catch, amateescu, claudiu.cristea, Berdir, Mile23, Sam152, pounard, fago, alexpott, fubhy, hchonov: Replace hard coded static cache of entities with cache backends

Issue #2804525 by shashikant_chauhan, joachim: EntityTypeManager should mention hook_entity_type_build()

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2626548 by dawehner, slashrsm: The static caching in \Drupal\Core\Entity\EntityTypeManagerInterface::getFormObject() is problematic

Issue #2337191 by tim.plunkett, dawehner, jibran, yched, Wim Leers, catch: Split up EntityManager into many services