In '$SPLUNK_BASE/etc/apps/pagerduty_incidents/local/alert_actions.conf' file -
changing key name from 'param.integration_url' to 'param.incidents_url' (as mentioned in $SPLUNK_BASE/etc/apps/pagerduty_incidents/README/alert_actions.conf.spec) fixed issue.
# File name: $SPLUNK_BASE/etc/apps/pagerduty_incidents/local/alert_actions.conf
[pagerduty]
disabled = 0
param.incident_url = https://events.pagerduty.com/integration/<integration_code>/enqueue
I believe this is something the app developer has to fix in the upcoming release.
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