When looking at the process list on civi1001 we noticed that the orphan-slater for paypal and ingenico was running for 12 and 5 hours plus respectively.
jgleeson@civi1001:/var/spool/prometheus$ ps aux --sort=-%mem,-%cpu | head -n 50 USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND www-data 14647 3.9 4.2 1047620 689480 ? S 16:00 12:52 php /usr/share/php/drush/drush.php --user=1 -v -r /srv/org.wikimedia.civicrm/drupal orphan-slayer paypal_ec www-data 26968 4.0 1.5 615740 254836 ? S 19:00 6:01 php /usr/share/php/drush/drush.php --user=1 -v -r /srv/org.wikimedia.civicrm/drupal orphan-slayer ingenico