{% macro render_tree(node) %}
<ul>
{% for key, value in node.items() %}
<li>
    {% if value is mapping %}
        <details open>
            <summary>{{ key }}</summary>
            {{ render_tree(value) }}
        </details>
    {% else %}
        {{ key }}: {{ value }}
    {% endif %}
</li>
{% endfor %}
</ul>
{% endmacro %}

{{ render_tree(message_stats) }}