Hydrate all entities in the system

entity-health.php

<?php
$doctrine = ...;

foreach ($entities as $entity) {
    $metadata = $doctrine->getEntityManager()->getClassMetadata($entity);
    $query = $doctrine->getEntityManager()->getRepository($entity)->createQueryBuilder('o');
    foreach ($metadata->getAssociationMappings() as $association) {
        $query->setFetchMode($entity, $association, 'EAGER');
    }
    try {
        foreach ($query->getIterator() as $result) {
            print '.';
        }
    } catch (\Exception $e) {
        var_dump($e);
    }
}