Run into this issue myself, by default the Pagerduty integration for Splunk deduplicates events on Search.
In PagerDuty -:
Services → Integrations → Integrations for Splunk → Edit integration
Under 'deduplicate on' options list -:
Search <- default option
Component
Host
Source
If open incident - attach results to it
Don’t deduplicate
If you select 'Don't deduplicate' you should find Pagerduty generate an incident for each event (if desired).
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