Prometheus Exposition Format

1. Text-based format

   Line oriented format scraped from /metrics endpoints.

2. Comments, HELP and TYPE lines

   HELP, TYPE lines, label escaping and sample syntax.

3. Histograms and summaries

   _bucket, _sum, _count and quantile series.

4. Protobuf format

   Delimited protobuf exposition.

5. OpenMetrics text format

   Relation to OpenMetrics.

6. Historical versions

   Format version compatibility.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.