High CPU Usage once the Hummingbird plugin was updated to the latest version of v 220.127.116.11 in the Multisite. Could notice the following log in Apache when the command is executed:
the error capture is log by apache
tail -f /var/log/apache2/domlogs/siteURL.com
"HEAD /?wphb-check-cf=true HTTP/1.1" 200 - "http://siteURL.vn/?wphb-check-cf=true" "WordPress/4.9.4; http://siteURL.vn
Please check the chat notes for more info about the logs.