OpenMetrics Specification

1. Overview

   Goals of OpenMetrics as an exposition standard.

2. Data model

   MetricFamily, Metric, MetricPoint and LabelSet.

3. Metric types

   Counter, gauge, histogram, summary, info, stateset, unknown.

4. Text format

   Line grammar, TYPE/HELP/UNIT metadata, EOF marker.

5. Exemplars

   Linking metric samples to trace IDs.

6. Protobuf format

   Protobuf wire format for metrics.

7. Protocol negotiation

   Content negotiation between scraper and target.

8. Design considerations

   Naming, label namespacing and timestamps.

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