doc/dev/plugins/problems/templates/reports/problems-report.html.twig

<ul class="problems">
  {% for problem in problems %}
    {% set status = problem.status ? 'success' : problem.level == 'critical' ? 'error' : 'warning' %}
    <li class="menu">
      <div class="toast toast-{{ status }}">
        <strong>{{ problem.id }}:</strong>
        {{ problem.msg|raw }}
        {% if problem.help %}<a href="{{ problem.help }}" class="btn btn-sm btn-{{ status }}" target="_blank"><i class="icon icon-bookmark"></i> Help</a>{% endif %}
      </div>
      {% if problem.details is iterable %}
        <ul class="details">
          {% for key,value in problem.details.errors %}
            <li class="menu-item">
              <div class="menu-badge">
                <label class="label label-error"><i class="icon icon-cross"></i></label>
              </div>
              <span class="active"><code>{{ key }}</code> - {{ value|raw }}</span>
            </li>
          {% endfor %}

          {% for key,value in problem.details.success %}
            <li class="menu-item">
              <div class="menu-badge">
                <label class="label label-success"><i class="icon icon-check"></i></label>
              </div>
              <span class=""><code>{{ key }}</code> - {{ value|raw }}</span>
            </li>
          {% endfor %}
        </ul>
      {% endif %}
    </li>
  {% endfor %}
</ul>