Attempting to execute the following step:

pagerdutyChangeEvent(integrationKey: 'REDACTED')

I discovered that the step is not available to Jenkins. Further investigation revealed that this stacktrace shows up on jenkins startup:

ec 8 16:33:49 ip-10-168-107-173 [jenkins]: 2020-12-08 16:33:49.073+0000 [id=34]#011WARNING#011h.ExtensionFinder$GuiceFinder$FaultTolerantScope$1#error: Failed to instantiate Key[type=org.jenkinsci.plugins.pagerduty.pipeline.PagerDutyChangeEventStep$DescriptorImpl, annotation=[none]]; skipping this component
Dec 8 16:33:49 ip-10-168-107-173 [jenkins]: java.lang.AssertionError: Outer class class org.jenkinsci.plugins.pagerduty.pipeline.PagerDutyChangeEventStep of class org.jenkinsci.plugins.pagerduty.pipeline.PagerDutyChangeEventStep$DescriptorImpl is not assignable to class org.jenkinsci.plugins.workflow.steps.Step. Perhaps wrong outer class?
Dec 8 16:33:49 ip-10-168-107-173 [jenkins]: #011at hudson.model.Descriptor.<init>(Descriptor.java:289)

I've submitted PR #41 to correct this.

I've also cross-posted this defect in the git repo under #42