Improve naming different metrics.

report_generator/template/report.html.j2

@@ -32,7 +32,7 @@
   </table>
 {% endmacro %}
 
-{% macro card(title, rows) %}
+{% macro card(title, rows, note="") %}
   {# Wrapped, because break-inside on the table does not hold its caption: the title would stay on
      one page while the rows it titles moved to the next. #}
   <div class="block">
@@ -45,6 +45,7 @@
       </tr>
     {% endfor %}
   </table>
+  {% if note %}<p class="note card-note">{{ note }}</p>{% endif %}
   </div>
 {% endmacro %}
 
@@ -158,7 +159,7 @@
   {% endfor %}
 
   {% for metric in summary.metrics or [] %}
-    {{ card(metric.title, metric.rows) }}
+    {{ card(metric.title, metric.rows, metric.note) }}
   {% endfor %}
 {% endif %}