Embedded TSDB Metrics Catalog

The TSDB sampler records all metric families exposed by the built-in Prometheus registry.

Family Coverage

• Counter
• Gauge
• Summary
• Histogram
• Info
• Untyped

Stored Series Conventions

• Counter/Gauge/Untyped/Info: stored as metric name exactly as exposed.
• Summary:
  • quantiles in <metric> with quantile label
  • <metric>_sum
  • <metric>_count
• Histogram:
  • buckets in <metric>_bucket with le label
  • <metric>_sum
  • <metric>_count

Because the source registry can evolve, there is no fixed hardcoded metric list in TSDB code.