In maintenance mode

Callback before_http_headers in mod_labelcollapsed component should be migrated to new hook callback for core\hook\output\before_http_headers

line 7230 of /lib/moodlelib.php: call to debugging()
line 7297 of /lib/moodlelib.php: call to {closure}()
line 47 of /lib/classes/hook/output/before_http_headers.php: call to get_plugins_with_function()
line 845 of /lib/classes/output/core_renderer.php: call to core\hook\output\before_http_headers->process_legacy_callbacks()
line ? of unknownfile: call to core\output\core_renderer->header()
line 109 of /lib/classes/output/bootstrap_renderer.php: call to call_user_func_array()
line 391 of /login/index.php: call to core\output\bootstrap_renderer->__call()

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