             </thead>
             <tbody>
                 {@recent_usage_stats_rows()}
+                <tr><td colSpan=5></td></tr>
+                <tr>
+                    <th style={textAlign:'left'}>File activity</th>
+                    <td colSpan=4>total (and unique) opened or edited</td>
+                </tr>
+                {@render_filetype_stats_rows()}
             </tbody>
         </Table>
-
-    render_historical_metrics: ->
-        return  # disabled, due to being broken...
-        <li key='usage_metrics' style={li_style}>
-            <a target='_blank' href='https://cocalc.com/b97f6266-fe6f-4b40-bd88-9798994a04d1/raw/metrics/metrics.html'>
-                <Icon name='area-chart' fixedWidth />Historical system metrics
-            </a> &mdash; CPU usage, running projects and software instances, etc
-        </li>
 
     render_when_updated: ->
         if @props.time

        for stat in stats
            <tr key={stat[0]}>
                <th style={textAlign:'left'}>{stat[0]}</th>
                <td>
                    {stat[1]?[RECENT_TIMES_KEY.last_hour]}
                </td>
                <td>
                    {stat[1]?[RECENT_TIMES_KEY.last_day]}
                </td>
                <td>
                    {stat[1]?[RECENT_TIMES_KEY.last_week]}
                </td>
                <td>
                    {stat[1]?[RECENT_TIMES_KEY.last_month]}
                </td>
            </tr>

    render_recent_usage_stats: ->

            accounts_created    : rtypes.object # {RECENT_TIMES.key → number, ...}
            projects_created    : rtypes.object # {RECENT_TIMES.key → number, ...}
            projects_edited     : rtypes.object # {RECENT_TIMES.key → number, ...}
            files_opened        : rtypes.object

    displayName : 'HelpPage-HelpPageUsageSection'

