Unable to access the Swagger UI endpoint at http://fms_hostname:port/api/openapi/swagger-ui as described in How to export and import an Alarm Template (4311807).
When accessing the Swagger UI URL it shows the default "Pet Store" APIs instead of the Foglight REST APIs.
WORKAROUND
To access the Alarm Template APIs in Swagger UI enter the API definition path /api/openapi/openapi-alarm-template-v1.yaml in the top bar an click Explore.

Only a limited subset of Foglight REST APIs are exposed through the Swagger UI. For additional information on the available APIs, refer to section Using REST API of the Foglight Documentation.
Other API definition paths accessible from the Swagger UI include:
STATUS
This issue was logged as defect FOG-11804 to restore access to the Swagger UI for the currently exposed APIs and fixed in the 8.1.0 and higher releases of Foglight.