When viewing the Deployments view in ROC (Releases --> Deployments), a full history of deployments is not shown, despite using the "All Deployments" filter.
This is not a problem with the Deployments view, but rather deployment history has moved elsewhere in more recent versions. The Deployments view, even with the "All Deployments" filter, is not intended to show all deployments over all time; rather it is meant to show a snapshot of all relatively recent deployments.
New features added to the Dashboard provide a wider range of options for reviewing deployment history, among other data. For example, one can use the "Add Content" button in the Dashboard view to add one or more reports and/or widgets. Among the reports available are historical reports that can cover any custom range of deployment history, including all deployments ever performed.