Outline and definition of alerts and alerting types received by default

[encima]

What should we add to our content collections?

What kind of alerting does Aiven support? i.e. webhooks, email, sms. Who gets these alerts? Can they be configured? What is the exhaustive list of alerts and their recipient(s)?

Is this something you would work on yourself?

[ ] I plan to open a pull request for this

[encima]

Internal link for reference: alerting/rules/user_alerts.yaml