With GAT Shield you can monitor who your users are chatting to on Google Hangouts Chat, you can gather information about how long the conversation lasts for and see the chat participates. The chat contents itself is not shown for security reasons.
You can quickly analysis whether your users are chatting with external domains. To do this click on the funnel icon on the top right of your screen. This button is called the Apply custom filter, it allows you to apply specific search criteria.
Once this is applied all external chats will appear in the search result.
GAT Shield does not track the contents of conversations, however if these conversations are on record (that is, the participants have not enabled the ‘History Off’ feature), then the contents are recorded under email audit and the contents can be seen by following the Security Officer approval process in GAT+, view email contents process.