custom-prometheus-exporter/templates/metrics.twig

{% for key, metric in config %}
{% if metric.help is defined and metric.help is not empty %}
# HELP {{ key }} {{ metric.help }}
{% endif %}
# TYPE {{ key }} {% if metric.type is defined and metric.type is not empty %}{{ metric.help }}{% else %}gauge{% endif %}

{% for subkey, submetric in metric.submetrics %}
{{ key }}{% if submetric.labels is defined and submetric.labels is not empty %}{{ '{' }}{% for label, value in submetric.labels %}{{ label }}="{{ value }}"{% if not loop.last %},{% endif %}{% endfor %}{{ '}' }}{% endif %} {{ submetric.value }}
{% endfor %}

{% endfor %}