In this tutorial, we will add a new feature to add the runbook to the portal. Light-4j has a status.yml in the status module to define the error code across the platform. For each application owner, they have an app-status.yml file to define the application-specific error codes. When the support team detects an error code in the log, they need to know how to react to it. The online runbook service or call it error service will resolve the DevOps team to respond to the errors quickly.
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