What you can see
The following metrics are available from the "Reports" tab in the admin panel:
Impressions: the number of times a display was shown
Clicks and click rate: how many times a button or link was clicked, and the percentage
Conversions and conversion rate: how many form submissions, coupon claims, etc. were completed, and the percentage
A/B test comparison: impressions, click rate, and conversion rate per variant
What is not currently available
Per-trigger breakdowns — such as "impressions from the back-button trigger" vs "impressions from the tab-return trigger" — are not currently available.
Workaround
To compare performance by trigger, create two displays with the same design and assign only one trigger to each. You can then track each trigger's results separately in their respective reports.