Const ExperimentalThis value can be determined precisely with the public suffix list. For example, the registered domain for foo.example.com is example.com. Trying to approximate this by simply taking the last two labels will not work well for TLDs such as co.uk.
This attribute is experimental and is subject to breaking changes in minor releases of @opentelemetry/semantic-conventions.
The highest registered url domain, stripped of the subdomain.