Issue #2288665 by znerol: Remove _maintenance request attribute and replace it with a maintenance mode service.
Issue #2295447 by yched: Fixed Leftover access to FieldInstanceConfig::$field.
Issue #1978976 by dawehner, kgoel, tim.plunkett, pcambra, longwave, Albert Volkman, vijaycs85, pfrenssen, jibran, Xano, David Hernández, shivachevva, kim.pepper, InternetDevels: Convert shortcut_set_switch to a Controller.
Issue #2290103 by damiankloip, larowlan: Rename 'item_length' to 'view_mode' to aid discoverability.
Issue #2296649 by longwave: Fixed Remove duplicate action.settings.yml.
Issue #2295383 by g3r4 | joachim: Fixed EntityStorageInterface::loadByProperties() needs to say what it returns when nothing found.
Issue #1906806 by Berdir, damiankloip, Sifro, dawehner: Provide a relationship for each entity reference field.
Issue #2216523 by jhodgdon: Fill in REST and Third Party @defgroup topic docs.
Issue #2098129 by er.pushpinderrana, drupal_sensei | joachim: Fixed DrupalDefaultEntityController::$entityCache should explain its structure.
Issue #2297201 by slashrsm: Fixed Wrong return type on ImageStyleInterface::setName().
Issue #2282161 by Crell: Split off link/url generation trait.
Issue #2297533 by longwave | marcingy: Remove drupal_check_memory_limit function.