A couple times this week alert manager has reported tools-harbor-1 as down. It's not actually all the way down but its load is VERY high:

root@tools-harbor-1:~# uptime
 15:49:19 up 3 days, 20:31,  1 user,  load average: 52.26, 51.23, 46.22

Plenty of free ram, but 'top' and 'iotop' won't launch due to the load.