wp-includes/class-wp-recovery-mode-key-service.php:32Creates a recovery mode token.
string public function generate_recovery_mode_token() { return wp_generate_password( 22, false ); }Introduced in 5.2.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-recovery-mode-key-service.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.