At this time AppOptics does not allow tags to be deleted. Since tags can be related to many different metrics, and are stored directly alongside measurements which are retained historically in our system, we have a requirement to keep them intact. Typically, bad or old tags will "age off" your graphs, but they will continue to be available/visible in the UI and the API.
When the APM Integrated Experience is enabled, AppOptics shares a common navigation and enhanced feature set with the other integrated experiences' products. How you navigate AppOptics and access its features may vary from these instructions. For more information, go to the APM Integrated Experience documentation.