The correct answer is: Watched Issues and Filter Results.

The Filter Results gadget displays issue rows from a saved filter and allows you to choose which columns to show. You can include the Training Environment custom field as one of the selected columns so it appears alongside Issue Type, Key, Summary and Priority.

The Watched Issues gadget lists issues you are watching and also lets you configure which fields display as columns. That configuration supports custom fields so Training Environment can be shown in the gadget.

The Issue Statistics gadget is not correct because it only shows counts grouped by a chosen field and it does not present issue rows with configurable columns.

The Activity Streams gadget is not correct because it shows a feed of recent activity rather than a table of issues, and it does not provide column configuration for custom fields.

The Two Dimensional Filter Statistics gadget is not correct because it produces a matrix of counts across two fields and it is not a row based list that can display custom field columns.

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