I see alerts and incidents having two attributes which sound similar:
What is the difference between them? How are they set?
Alerts in PagerDuty can be generated with a severity field. These severity values can be directly provided from the triggering monitoring tool, or set using event rules. When an incident is generated from an alert, the alert’s severity field is used to determine the urgency level. The values of this field must be one of the following: critical, error, warning, or info.
More info here: https://support.pagerduty.com/docs/dynamic-notifications#eventalert-severity-levels
More information on Priority: https://support.pagerduty.com/docs/incident-priority