20.0.2RC2, message":"/appinfo/app.php is deprecated, use \\OCP\\AppFramework\\Bootstrap\\IBootstrap on the application class instead."

[RainerEmrich]

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Steps to reproduce

1. Update to 20.0.2RC2

Actual behaviour

log is flooded by messages as follows for all apps:
message":"/appinfo/app.php is deprecated, use \OCP\AppFramework\Bootstrap\IBootstrap on the application class instead."

Server configuration

Operating system:
Ubuntu18.04

Web server:
apache-2.4.46

Database:
mariadb-10.4.17

PHP version:
php-7.4.12

Nextcloud version: (see Nextcloud admin page)
20.0.2RC2

Updated from an older Nextcloud/ownCloud or fresh install:
Updated from 20.0.2RC1

[kesselb]

Duplicate of #23046