The Dimensions & Metrics Explorer lists and describes all of the dimensions and metrics available through the Core Reporting API.
The Dimensions & Metrics Explorer has the following features:
Explore all of the dimensions and metrics – Search or browse by group. Select a dimension or metric for additional details such as descriptions and attributes.
Identify valid combinations – Not all dimensions and metrics can be queried together. Only certain dimensions and metrics can be used together to create valid combinations. Select a dimension or metric checkbox to see all the other values that can be combined in the same query.