We upgraded the pagerduty plugin from 0.2.6 to 0.6.2 and now all of our jobs that used to send pagerduty alerts no longer work.

Here is a screenshot of the job config before and after the upgrade:

The error in the logs, after the upgrade, is:
ERROR: [flexible-publish] PagerDuty Incident Trigger (org.jenkinsci.plugins.pagerduty.PagerDutyTrigger@6d5b3496) aborted due to exception
java.lang.IllegalStateException: No match found
at java.util.regex.Matcher.group(Matcher.java:536)
at org.jenkinsci.plugins.pagerduty.util.PagerDutyUtils.extractDedupKey(PagerDutyUtils.java:36)
at org.jenkinsci.plugins.pagerduty.PagerDutyTrigger.perform(PagerDutyTrigger.java:215)
at org.jenkins_ci.plugins.flexible_publish.builder.FailAtEndBuilder.perform(FailAtEndBuilder.java:106)
at org.jenkins_ci.plugins.run_condition.BuildStepRunner$2.run(BuildStepRunner.java:112)
at org.jenkins_ci.plugins.run_condition.BuildStepRunner$Fail.conditionalRun(BuildStepRunner.java:156)
at org.jenkins_ci.plugins.run_condition.BuildStepRunner.perform(BuildStepRunner.java:107)
at org.jenkins_ci.plugins.flexible_publish.strategy.FailAtEndExecutionStrategy.perform(FailAtEndExecutionStrategy.java:86)
at org.jenkins_ci.plugins.flexible_publish.ConditionalPublisher.perform(ConditionalPublisher.java:206)
at org.jenkins_ci.plugins.flexible_publish.FlexiblePublisher.perform(FlexiblePublisher.java:124)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:741)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:690)
at hudson.model.Build$BuildExecution.post2(Build.java:186)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:635)
at hudson.model.Run.execute(Run.java:1919)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:428)
 

We are now in the process of upgrading all our jobs, but it stinks that this happened.