code/Debug/Model/RequestInfo.php
public function getObservers()
    {
        if ($this->observers === null) {
            $this->observers = array();

            foreach ($this->getTimers() as $timerName => $timer) {
                if (strpos($timerName, 'OBSERVER') === 0) {
                    $this->observers[] = array(
                        'name'     => $timerName,
                        'count'    => $timer['count'],
                        'sum'      => round($timer['sum'] * 1000, 2), // ms
                        'mem_diff' => $timer['realmem'] / pow(1024, 2), // MB
                    );
                }
            }
        }

        return $this->observers;
    }
public function getObservers()
    {
        if ($this->observers === null) {
            $this->observers = array();

            foreach ($this->getTimers() as $timerName => $timer) {
                if (strpos($timerName, 'OBSERVER') === 0) {
                    $this->observers[] = array(
                        'name'     => $timerName,
                        'count'    => $timer['count'],
                        'sum'      => round($timer['sum'] * 1000, 2), // ms
                        'mem_diff' => $timer['realmem'] / pow(1024, 2), // MB
                    );
                }
            }
        }

        return $this->observers;
    }
Returns a list of called observers during request.
Observers are determined based on Varien Profiler timers

@return array