gate-64 (apphost-autoload-prelude) requires \OC_App::registerAutoloading(), which Nextcloud 35 removed

[WilcoLouwerse]

Found during a Strict review of ConductionNL/keepiq#712. Present on ConductionNL/.github@main (hydra-gates/scripts/lib/check_apphost_autoload_prelude.py, last changed in 52146a9).

Impact

Gate-64 (apphost-autoload-prelude) only passes an AppHost app whose prelude calls registerAutoloading(...) naming openregister. In practice that means \OC_App::registerAutoloading(). Nextcloud 35 removed that method. On NC 35, an app that satisfies the gate breaks. Its prelude throws, the catch (\Throwable) returns false, the class_exists(Bootstrap::class) guard skips the AppHost wiring, and /api/health plus /api/metrics return 500 with an HTML page. Nothing is logged.

It fires on the happy path, on a healthy instance with OpenRegister enabled. The only precondition is an app id that sorts before openregister, because only those apps depend on the prelude for load order. An app that fixes itself with public API has to add an apphost-prelude exclude to get past the gate, as keepiq#712 now does.

The chain

1. nextcloud/server@stable34 lib/private/legacy/OC_App.php:104: registerAutoloading() exists (@internal).
2. nextcloud/server@stable35: OC_App has no registerAutoloading(). The method moved to OC\App\AppManager::registerAutoloading() at line 595, which is private too and not on OCP\App\IAppManager.
3. check_apphost_autoload_prelude.py:96: PRELUDE = re.compile(r"registerAutoloading\s*\(([^)]*)\)", re.S). The accepted alternative is loadApp('openregister') (line 115), which boots OpenRegister before its own register(), and keepiq#712 explains why that is worse.
4. keepiq#712 replaced the call with spl_autoload_register over IAppManager::getAppPath('openregister') . '/lib/', which is public API. It had to suppress gate-64 at lib/AppInfo/Application.php:138. The comment there says "Tracked for hydra-gates", but no issue existed until this one.

Verified by reading code at ConductionNL/.github@main and ConductionNL/keepiq@7f8e256. Not executed on NC 35 here; keepiq#712's Newman run on stable35 is the reproduction.

Apps that still call the removed method on development

Only the apps that sort before openregister depend on the prelude:

App	max-version on development	NC 35 exposure
integriq	35	Live: advertises NC 35 while still calling \OC_App::registerAutoloading() (lib/AppInfo/Application.php:210)
buildiq, decidiq, dossiq, filinq, hermiq, larpinq, learniq	34	Breaks on the bump to 35
keepiq	34 → 35 in #712	Fixed in #712 with a suppression

pipelinq, planninq and thematiq also call it but sort after openregister, so they do not depend on it for load order. They still throw into their catch on NC 35.

Close condition

1. Gate-64 accepts a prelude that registers the OCA\OpenRegister\ PSR-4 prefix by public means: spl_autoload_register plus IAppManager::getAppPath('openregister'), or an equivalent the gate can recognise. It also stops requiring registerAutoloading, or at least stops requiring it on apps that declare max-version >= 35.
2. A gate fixture covers the keepiq#712 shape passing without an exclude.
3. keepiq's apphost-prelude exclude can then be removed. A follow-up per app in the table above ports its prelude, integriq first.