Attribute Macro measured_async_function

#[measured_async_function]

A procedural macro attribute that measures the execution time of an async function.

This macro wraps an async function to record its execution duration as a histogram metric. The duration is recorded using the FunctionDurationSeconds metric with a “function” label containing either the function name or a custom name if provided.

Arguments

• attr - Optional custom name for the metric label
• item - The async function to be measured

Examples

Basic usage with default function name as label:

use metrics_macros::measured_async_function;

#[measured_async_function]
async fn process_data() {
    // Function implementation
}

Using a custom name for the metric label:

use metrics_macros::measured_async_function;

#[measured_async_function("custom_process_name")]
async fn process_data() {
    // Function implementation
}

The macro will record timing metrics that can be queried like: function_duration_seconds{function="process_data"} or function_duration_seconds{function="custom_process_name"}