Crate reqwest_metrics 

Metrics.rs integration for reqwest using reqwest-middleware

Features

• Adheres to Open Telemetry HTTP Client Semantic Conventions
• Customizable labels

Usage

let client = ClientBuilder::new(reqwest::Client::new())
    .with(MetricsMiddleware::new())
    .build();

Configuration

Overriding label names

let client = ClientBuilder::new(reqwest::Client::new())
    .with(
        MetricsMiddleware::builder()
            .http_request_method_label("method")
            .http_response_status_label("status")
            .server_address_label("host")
            .build(),
    )
    .build();

Supported metrics:

• http.client.request.duration
• http.client.request.body.size
• http.client.response.body.size

Supported labels:

• http_request_method
• server_address
• server_port
• error_type
• http_response_status_code
• network_protocol_name
• network_protocol_version
• url_scheme

Motivation

This crate is heavily inspired by the HTTP Client metrics provided by Spring. This crate aims to provide the same functionality while adhereing to Otel semantic conventions.

Structs

MetricsMiddleware

Middleware to handle emitting HTTP metrics for a reqwest client NOTE: Creating a [MetricMiddleware] will describe a histogram on construction.

MetricsMiddlewareBuilder

Builder for MetricsMiddleware