Customer is looking to track down who (the user) unregistered (delete the binding) the app to the service.
Tanzu Platform for Cloud Foundry
You can try querying the audit event.
Example - to list the deleted service bindings:
cf curl '/v3/audit_events?types=audit.service_binding.delete'
Then locate the app and service guid as shown below.
This will result to
{ "guid": "fc589446-b7c8-4e40-b029-31c7393d37dd", "created_at": "2025-05-20T18:53:31Z", "updated_at": "2025-05-20T18:53:31Z", "type": "audit.service_binding.delete", "actor": { "guid": "9382419f-2a4b-4d93-a71f-55eb08399705", "type": "user", "name": "my-user-name" }, "target": { "guid": "f8dbae17-1ab8-48ed-ba3a-f50f34dd6a7e", "type": "service_binding", "name": "" }, "data": { "request": { "app_guid": "8f01330d-d9a6-46be-8bc2-795ae7694833", <<< app-guid "service_instance_guid": "9930307b-4d63-420b-b063-9ee2cb048fb3". <<<< service-guid } }, "space": { "guid": "ca1f99a0-17be-46f8-9d48-3f105f7d29d9" }, "organization": { "guid": "cdf12270-621a-4337-8df9-3644e1decca5" }, "links": { "self": { "href": "https://api.example.com/v3/audit_events/fc589446-b7c8-4e40-b029-31c7393d37dd" }
Reference:
https://docs.cloudfoundry.org/running/managing-cf/audit-events.html#service-bind-lifecycle