Function prometheus_http_query::aggregations::stddev

pub fn stddev(
    vector: InstantVector, 
    labels: Option<Aggregate<'_>>
) -> InstantVector

Use the stddev aggregation operator on an instant vector.

use prometheus_http_query::{Selector, InstantVector, Aggregate};
use prometheus_http_query::aggregations::stddev;
use std::convert::TryInto;

fn main() -> Result<(), prometheus_http_query::Error> {
    let vector: InstantVector = Selector::new()
        .metric("promhttp_metric_handler_requests_total")?
        .try_into()?;

    let result = stddev(vector, Some(Aggregate::By(&["code"])));

    assert_eq!(result.to_string(), String::from("stddev by (code) (promhttp_metric_handler_requests_total)"));

    Ok(())
}