fast-telemetry

High-performance, cache-friendly telemetry for Rust.

Thread-sharded counters, gauges, histograms, distributions, and lightweight spans with Prometheus, DogStatsD, OTLP, and optional first-party ClickHouse row export.

#[derive(ExportMetrics)] also generates visit_metrics, a structured in-process export path for custom MetricVisitor implementations that need typed cumulative observations instead of a wire-format string or protobuf.

Enable the runtime feature when a parent crate should own one shared telemetry service for metric registration, span collection, and export setup while child crates keep hot paths on direct metric handles.

See the workspace README for full documentation, examples, runtime integration rules, and API reference.

Companion Crates

• fast-telemetry-macros — #[derive(ExportMetrics)] and #[derive(LabelEnum)]
• fast-telemetry-export — DogStatsD, OTLP, ClickHouse, and span export adapters

Lineage

The Counter implementation originated from JackThomson2/fast-counter.