healthchecks/templates/integrations/sms_message.html

{% load humanize %}
{% if check.status == "down" %}
    {{ site_name }}: The check "{{ check.name_then_code|safe }}" is DOWN. Last ping was {{ check.last_ping|naturaltime }}.
{% else %}
    {{ site_name }}: The check "{{ check.name_then_code|safe }}" is UP.
{% endif %}