wp-includes/class-wpdb.php:4196Retrieves a comma-separated list of the names of the functions that called wpdb.
string public function get_caller() { return wp_debug_backtrace_summary( __CLASS__ ); }Introduced in 2.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wpdb.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.