For the list of existing metrics see the tables under the Measurements page of Ceilometer in the Cloud Administrator Guide.
If you would like to add new meters please check the New measurements page under in the Contributing section.
All messages with event type “profiler.*” will be collected as profiling data. Using notification plugin profiler/notifications.py.
Note
Be sparing with heavy usage of OSprofiler, especially in case of complex operations like booting and deleting instance that may create over 100kb of sample data per each request.