Total Impressions: Lifetime # of Impressions served across all campaigns.
Total Clicks: Lifetime # of Clicks on ad placements.
Total New Leads: Lifetime # of New Leads from all experiments.
Total MQLs: Lifetime # of Leads that are scored as Marketing Qualified (MQL).
Total New Opportunities: Lifetime # of Opportunities created from converted leads.
Total Amount: Lifetime # spent on campaigns through the platform.
Clicking the gear icon in Campaign Stats will allow you to adjust any of the displayed fields. You may also customize the Snippets that are showing below the Campaign Stats section by clicking "Snippets".