Issue interface_async_executor causing huge load average, AGAIN!

[burnley]

CentOS Linux 7.7.1908 (Core)
Plesk Obsidian Version 18.0.23 Update #3, last updated on Feb 5, 2020 10:36 PM

ps auxww | grep '/usr/local/psa/admin/plib/scripts/interface_async_executor' | wc -l
818
ps auxww | grep 'wp-toolkit' | wc -l
147

This is a joke! 4:30pm in the afternoon and plesk decides it's a very clever idea to start hammering the server with these processes? Think we've seen and reported this before and was apparently caused by wp-toolkit? Regression? Noooo, that's not possible, we don't cause regression!

 

[burnley]

And on another "lucky" server:
ps auxww | grep 'usr/local/psa/admin/plib/scripts/interface_async_executor' | wc -l
2355

L.E. What extensions can I use to upload files? Tried .out, .txt and .txt.gz and keep getting "The uploaded file does not have an allowed extension" error.

 

[burnley]

One or more of these 5 scripts could be causing the massive disturbance:
/usr/local/psa/admin/plib/modules/advisor/scripts/update-config.php
/usr/local/psa/admin/plib/modules/letsencrypt/scripts/keep-secured.php
/usr/local/psa/admin/plib/modules/sslit/scripts/complete-order.php
/usr/local/psa/admin/plib/modules/sslit/scripts/keep-secured.php
/usr/local/psa/admin/plib/modules/wp-toolkit/scripts/maintenance.php