Return a string to display as the clickable title for the access control.
Overrides CachePluginBase::summaryTitle
public function summaryTitle() {
$results_lifespan = $this
->getLifespan('results');
$output_lifespan = $this
->getLifespan('output');
return format_interval($results_lifespan, 1) . '/' . format_interval($output_lifespan, 1);
}