-<% content_for :tab_panes do %>
-<div class='cache-age-vs-disk-histogram'>Histogram will go here.</div>
+<% unless @histogram_pretty_date.nil? %>
+ <% content_for :tab_panes do %>
+ <script type="text/javascript">
+ $(document).ready(function(){
+ $.renderHistogram(<%= raw @cache_age_histogram.to_json %>);
+ });
+ </script>
+ <div class='graph'>
+ <h3>Cache Age vs. Disk Utilization</h3>
+ <h4>circa <%= @histogram_pretty_date %></h4>
+ <div id='cache-age-vs-disk-histogram'>
+ </div>
+ </div>
+ <% end %>