title: What does "##vso" mean in Azure pipeline?
body: <p><a href="https://docs.microsoft.com/en-us/azure/devops/pipelines/scripts/logging-commands?view=azure-devops&amp;tabs=bash" rel="noreferrer">https://docs.microsoft.com/en-us/azure/devops/pipelines/scripts/logging-commands?view=azure-devops&amp;tabs=bash</a></p>
  <p>I can find an official doc explains this. Please help.</p>