Function prometheus_http_query::functions::delta
source · [−]pub fn delta(vector: RangeVector) -> InstantVector
Expand description
Apply the PromQL delta
function.
use prometheus_http_query::{Client, Selector, RangeVector};
use prometheus_http_query::functions::delta;
use std::convert::TryInto;
#[tokio::main(flavor = "current_thread")]
async fn main() -> Result<(), prometheus_http_query::Error> {
let client = Client::default();
let vector: RangeVector = Selector::new()
.metric("prometheus_http_requests_total")
.range("1m")?
.try_into()?;
let q = delta(vector);
let response = client.query(q, None, None).await?;
let first_item = response.as_instant()
.unwrap()
.get(0);
assert!(first_item.is_some());
Ok(())
}