https://github.com/max-te/ottotom

Conversion of opentelemetry-rust metrics into openmetrics text format to replace opetelemetry-prometheus
https://github.com/max-te/ottotom

openmetrics opentelemetry prometheus rust

Last synced: 5 months ago
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Conversion of opentelemetry-rust metrics into openmetrics text format to replace opetelemetry-prometheus

• Host: GitHub
• URL: https://github.com/max-te/ottotom
• Owner: max-te
• License: apache-2.0
• Created: 2026-01-13T19:43:28.000Z (5 months ago)
• Default Branch: main
• Last Pushed: 2026-01-13T20:40:44.000Z (5 months ago)
• Last Synced: 2026-01-13T22:21:53.620Z (5 months ago)
• Topics: openmetrics, opentelemetry, prometheus, rust
• Language: Rust
• Homepage:
• Size: 84 KB
• Stars: 0
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Ottotom (OpenTelemetry to text OpenMetrics)

A Rust crate for exporting OpenTelemetry metrics in the [OpenMetrics](https://github.com/prometheus/OpenMetrics) text format.

This serves as a protobuf-free alternative to the discontinued `opentelemetry-prometheus` crate.

> ⚠️ **Warning:** This implementation is not fully spec-compliant for [OpenTelemetry-to-OpenMetrics conversion](https://github.com/open-telemetry/opentelemetry-specification/blob/v1.45.0/specification/compatibility/prometheus_and_openmetrics.md). Some edge cases and complex metrics setups may not be handled correctly. This library is still in an experimental state.

## Features

- **Conversion** of `opentelemetry-sdk` metric data to OpenMetrics-compliant text.

- **Ready-to-use Exporter** to register in `opentelemetry`, outputs metrics in the OpenMetrics text format.

## Usage

```rust,no_run

use std::time::Duration;

use ottotom::exporter::OpenMetricsExporter;

use opentelemetry_sdk::metrics::PeriodicReader;

use opentelemetry_sdk::metrics::SdkMeterProvider;

pub fn init_openmetrics_exporter() -> OpenMetricsExporter {

    let exporter = OpenMetricsExporter::default();

    let reader = PeriodicReader::builder(exporter.clone())

        .with_interval(Duration::from_secs(1))

        .build();

    let meter_provider = SdkMeterProvider::builder()

        .with_reader(reader)

        .build();

    opentelemetry::global::set_meter_provider(meter_provider);

    exporter

}

let exporter = init_openmetrics_exporter();

// Retain the exporter in you app state. Register some opentelmetry meters and fill them with data.

// Later on (e.g. in a `/metrics` endpoint) read the current metrics:

async {

    let openmetrics = exporter.text().await;

    println!("{}", openmetrics);

};

```