Issue #2932518 by kim.pepper, joachim, bradjones1, voleger, cliddell, gapple, Xano, andregp, andypost, neclimdul, rpayanm, Hardik_Patel_12, NWOM, smustgrave, dawehner, alexpott, daffie, larowlan, Berdir, mstrelan, xjm, dagmar: Deprecate watchdog_exception

Issue #1120020 by effulgentsia, andypost, Garrett Albright, pfrenssen, Taran2L, kim.pepper, andregp, phenaproxima, daffie, geek-merlin, rfay, ranjith_kumar_k_u, tf198, Damien Tournoud, alexpott, xjm, chx, bradjones1, hestenet: SQLite database locking errors cause fatal errors

Issue #3232097 by daffie, longwave: [Symfony 6] Add "array" type hint to methods overriding Symfony\Component\EventDispatcher\EventSubscriberInterface::getSubscribedEvents()

Issue #3055198 by catch, longwave, mikelutz, alexpott: [Symfony 5] Symfony/Component/EventDispatcher/Event is deprecated in Symfony 4.3 use Symfony/Contracts/EventDispatcher/Event instead

Issue #2286235 by andypost, longwave, ericduran, alexpott, voleger, catch: Deprecate db_ignore_replica() and convert it to service

Issue #2848820 by jeetendrakumar, andypost, mondrake, vidhatanand: Replace all calls to db_transaction, which is deprecated

Issue #2909368 by mfernea, reflie, zaporylie: Fix 'Drupal.Commenting.VariableComment.InlineVariableName' coding standard

Issue #2854529 by alexpott, xjm, klausi, Chi, Mixologic: Fix Drupal.Scope.MethodScope - all methods should have scopes

Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2801899 by shashikant_chauhan, daffie, axel.rutz: Rename Drupal\Core\Database\Connection::rollback() to Drupal\Core\Database\Connection::rollBack()

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

Issue #2480811 by catch, dawehner, Crell, Berdir, amateescu: Cache incoming path processing and route matching

Issue #356399 by dawehner, beejeebus, catch, sidharrell, klausi, nlisgo, Josh Waihi, Berdir, martin107: Optimize the route rebuilding process to rebuild on write

Issue #2340123 by Wim Leers: Setting cache tags can be tricky: use strings instead of nested arrays to improve DX.

Issue #2301317 by pwolanin, dawehner, Wim Leers, effulgentsia, YesCT, xjm, alexpott: MenuLinkNG part4: Conversion.

Revert "Issue #2301317 by pwolanin, effulgentsia, Wim Leers, dawehner, alexpott: MenuLinkNG part4: Conversion."

This reverts commit fd2db9cd.

Issue #2301317 by pwolanin, effulgentsia, Wim Leers, dawehner, alexpott: MenuLinkNG part4: Conversion.

Issue #2124957 by Wim Leers, catch: Replace 'content' cache tag with 'rendered' and use it sparingly.

Issue #2164367 by alexpott, tim.plunkett, dawehner: Rebuild router as few times as possible per request.