wp-admin/includes/class-automatic-upgrader-skin.php:129Retrieves the buffered content, deletes the buffer, and processes the output.
public function footer() { $output = ob_get_clean(); if ( ! empty( $output ) ) { $this->feedback( $output ); } }Introduced in 3.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/class-automatic-upgrader-skin.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.