Prometheus metric syntax

Syntax used to expose metrics to prometheus.

Documentation

official docs	https://prometheus.io/docs/instrumenting/exposition_formats/
text-based	https://prometheus.io/docs/instrumenting/exposition_formats/#text-format-details
metric types	https://prometheus.io/docs/concepts/metric_types/
writing exporters	https://prometheus.io/docs/instrumenting/writing_exporters/

Comments

In addition to regular comments, doc-comments exist for

• HELP describing metrics
• TYPE describing metric type

# regular comment               // possibly invalid?

# HELP metric_name  Does thing  // description of metric
# TYPE metric_name  counter     // counter, gauge, historgram

Metrics

my_metric 1.2

my_metric{hostname="foobar", user="baz"}  1.2