{% set capacity_available = size - in_use %}
{% set at_capacity = size > 0 and capacity_available <= 0 %}
<div class="pool-status">
    <span class="pool-health{% if at_capacity %} error{% endif %}">
        <span class="pool-dot {% if at_capacity %}empty{% else %}available{% endif %}"></span>
        {% if at_capacity %}Busy{% else %}Healthy{% endif %}
    </span>
    <span class="pool-count">{{ [capacity_available, 0]|max }}/{{ size }} capacity</span>
</div>