Source

File: wp-admin/includes/class-wp-site-health.php

private function get_cron_tasks() {
		$cron_tasks = _get_cron_array();

		if ( empty( $cron_tasks ) ) {
			$this->crons = new WP_Error( 'no_tasks', __( 'No scheduled events exist on this site.' ) );
			return;
		}

		$this->crons = array();

		foreach ( $cron_tasks as $time => $cron ) {
			foreach ( $cron as $hook => $dings ) {
				foreach ( $dings as $sig => $data ) {

					$this->crons[ "$hook-$sig-$time" ] = (object) array(
						'hook'     => $hook,
						'time'     => $time,
						'sig'      => $sig,
						'args'     => $data['args'],
						'schedule' => $data['schedule'],
						'interval' => isset( $data['interval'] ) ? $data['interval'] : null,
					);

				}
			}
		}
	}