Webhook not triggered

Hi, I have a gitlab self managed instance on version 18.5. I’ve created a project level webhook with issue events and then I create an issue in my that project. But when I check recent deliveries, I dont see any. I tried other events as well.. but nothing is working. could someone please help me here. I did check Silent mode and it is not enabled.

are there any logs that i could check to see if webhook delivery was even attempted?

I even tested on SaaS and sometimes my webhooks are delivered really slow like 10 mins after the event is generated and sometimes I dont even get the event. What factors affect the webhook delivery speed in SaaS? and what is a general timeframe for webhooks to be sent?