title: How to conditionally fail an Azure Devops Pipeline stage?
body: <p>Say I have a pipeline where I invoke a Lambda and it responds 'true'. In this case, the pipeline should proceed. In the other case where the lambda responds 'false', I want to be able to look at that output variable and if it is false, manually fail the deployment stage (so that I can redeploy an old version of the code).</p>
  <p>Seems like a simple enough question, but I can't find any info on this simple task.</p>