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The pull request view in GitHub is probably the most important place for developers. Tentacle makes sure that the links defined in the catalog-info.yaml file are also visible in the pull request view. For this to work, you need to add the pullRequestLinks attribute to the catalog-info.yaml file. 
apiVersion: backstage.io/v1alpha1
kind: Component
metadata:
  name: artist-service
  links:
    - url: https://admin.example.com
      title: Admin Dashboard
+ tentacle:
+   pullRequestLinks:
+    - url: https://dev.example.com
+      title: Dev instance
spec:
  type: service
  lifecycle: production
  owner: team-awesome
But that’s not all! Tentacle also provides a way to define dynamic links that will take your developers to the right place in the right context. For example, you can define a link that will take your developers to the pull request view of the current repository. 
apiVersion: backstage.io/v1alpha1
kind: Component
metadata:
  name: artist-service
  links:
    - url: https://admin.example.com
      title: Admin Dashboard
  tentacle:
    pullRequestLinks:
      - url: https://dev.example.com
        title: Dev instance
+     - title: Preview
+       url: https://preview-{% $pullrequest.number %}.dev.example.com
+     - title: JIRA {% $pullrequest.jira_prefix %}
+       url: https://jira.company.com/{% $pullrequest.jira_prefix %}
spec:
  type: service
  lifecycle: production
  owner: team-awesome