https://github.com/max-te/opentelemetry-openmetrics-text

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

Last synced: 11 months ago
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Haphazard conversion of opentelemetry-rust metrics into openmetrics text format to replace opetelemetry-prometheus

• Host: GitHub
• URL: https://github.com/max-te/opentelemetry-openmetrics-text
• Owner: max-te
• License: apache-2.0
• Created: 2025-07-05T13:01:13.000Z (12 months ago)
• Default Branch: main
• Last Pushed: 2025-07-19T19:10:48.000Z (11 months ago)
• Last Synced: 2025-07-19T20:01:06.321Z (11 months ago)
• Language: Rust
• Homepage:
• Size: 103 KB
• Stars: 0
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# opentelemetry-openmetrics

A Rust library for exporting OpenTelemetry metrics in the 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 output metrics in the OpenMetrics text format.

## How to use

```rust

use std::time::Duration;

use opentelemetry_openmetrics::exporter::OpenMetricsExporter;

use opentelemetry_sdk::metrics::PeriodicReader;

use opentelemetry_sdk::metrics::SdkMeterProvider;

pub fn init_openmetrics_exporter() -> OpenMetricsExporter {

    let exporter = OpenMetricsExporter::new();

    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.

// Register and fill some meters.

// Later read the current metrics:

let openmetrics = exporter.text().await;

```