* @param bool $migrated Migration status.
* @param string $plugin_name Plugin name.
* @param string $upgrade_version Upgrade version.
private function log_migration_message( bool $migrated, string $plugin_name, string $upgrade_version ) {
sprintf( 'Migration of %1$s to %2$s completed.', $plugin_name, $upgrade_version ) :
sprintf( 'Migration of %1$s to %2$s failed.', $plugin_name, $upgrade_version );