The current version of the API is v2:
.. toctree:: :maxdepth: 2 trace_v2/services trace_v2/types
Support for the previous API release, v1, is provided for code previously
written against it.
.. toctree:: :maxdepth: 2 trace_v1/services trace_v1/types
For a list of all google-cloud-trace releases:
.. toctree:: :maxdepth: 2 changelog