List of available metrics that AppNexus provides through an API available here.
We highly recommend to contact integration platforms to figure out what metrics they can extract. Sometimes integration platforms don't have certain metrics out of the box, so it's better to contact them.
More integrations to Google Big Query
Like spreadsheets, but a lot more powerful. BigQuery is a tool that lets you query massive datasets instantly and get results in seconds or milliseconds.
Your BigQuery data can be integrated with other information. Find out what you can connect to your data warehouse.