healthchecks/templates/integrations/telegram_message.html

{% load humanize %}
{% if check.status == "down" %}
The check "{{ check.name_then_code }}" is <b>DOWN</b>. Last ping was {{ check.last_ping|naturaltime }}.
{% else %}
The check "{{ check.name_then_code }}" received a ping and is now <b>UP</b>.
{% endif %}