I started getting a 504 gateway timeout error this morning. Looking at my PHP error logs I’m seeing a TON of errors at that time for one particular site on the server:

[08-Jul-2021 07:39:23] WARNING: [pool coa] child 5912, script '/srv/.../public/index.php' (request: "HEAD /index.php?u55098017845Y83713097752ga120390874027X270621384728") executing too slow (5.757430 sec), logging [08-Jul-2021 07:39:23] WARNING: [pool coa] child 5904, script '/srv/.../public/index.php' (request: "HEAD /index.php?j152370937559R123742059028Pt17864590990v728125838656") executing too slow (5.863548 sec), logging 

I have no idea what this means and have questions:

• why does the ‘request’ have a long string variable after it?
• what does [pool coa] child mean?

Additionally, when I look at my analytics traffic, I can’t see any spikes so I’m unsure what’s causing this.

Any suggestions on where to start?