Confluence Cloud have webhooks, but not in Server & Data Center. Also, at the moment, Jira supports webhooks.
To be able to integrate Confluence with other tools we need Webhooks. https://en.wikipedia.org/wiki/Webhook
Webhooks are the defacto standard today and many tools (chat, ticket systems, bugtrackers, runners, CI, etc. pp) support them.
You already have all the Webhook events available in Confluence Cloud
In addition an admin page is needed, where webhooks can be created.