drupal/core/modules/comment/comment.routing.yml

comment_edit_page:
  pattern: '/comment/{comment}/edit'
  defaults:
    _entity_form: 'comment.default'
  requirements:
    _entity_access: 'comment.update'

comment_approve:
  pattern: '/comment/{comment}/approve'
  defaults:
    _content: '\Drupal\comment\Controller\CommentController::commentApprove'
    entity_type: 'comment'
  requirements:
    _entity_access: 'comment.approve'

comment_permalink:
  pattern: '/comment/{comment}'
  defaults:
    _controller: '\Drupal\comment\Controller\CommentController::commentPermalink'
  requirements:
    _entity_access: 'comment.view'

comment_confirm_delete:
  pattern: '/comment/{comment}/delete'
  defaults:
    _entity_form: 'comment.delete'
  requirements:
    _entity_access: 'comment.delete'

comment_reply:
  pattern: 'comment/reply/{node}/{pid}'
  defaults:
    _content: '\Drupal\comment\Controller\CommentController::getReplyForm'
    pid: ~
  requirements:
    _entity_access: 'node.view'