Glossary

Terms

Agent — a lightweight binary on the host that pushes metrics over mTLS.

Cardinality — the number of unique {label_set} combinations. The main driver of storage cost.

Embed JWT — a short-lived token for an iframe widget with baked-in filters.

Evaluator — a background goroutine that evaluates alert rules every 30s.

Fingerprint — hash(rule_id + sample_labels). Deduplicates incidents.

mTLS — mutual TLS; both sides verify each other's certificates.

Mandatory matcher — a label filter that is injected into PromQL by force (organization_id).

PromQL — Prometheus Query Language. The de facto standard for time series.

RegionRouter — an in-memory map of regionID → TSDB client.

SCIM — System for Cross-domain Identity Management. RFC 7644.

Series — a unique time series identified by metric_name + label_set.

Silence — an ad-hoc mute, "do not notify about this for N minutes".

TSDB — a time-series database. Prometheus-compatible.