Driver metrics

During operation the driver collects various metrics.

They can be accessed at any moment using Session::get_metrics()

Collected metrics:

• Query latencies
• Total number of nonpaged queries
• Number of errors during nonpaged queries
• Total number of paged queries
• Number of errors during paged queries
• Number of retries

Example

#![allow(unused)]
fn main() {
extern crate scylla;
use scylla::Session;
use std::error::Error;
async fn check_only_compiles(session: &Session) -> Result<(), Box<dyn Error>> {
let metrics = session.get_metrics();

println!("Queries requested: {}", metrics.get_queries_num());
println!("Iter queries requested: {}", metrics.get_queries_iter_num());
println!("Errors occured: {}", metrics.get_errors_num());
println!("Iter errors occured: {}", metrics.get_errors_iter_num());
println!("Average latency: {}", metrics.get_latency_avg_ms().unwrap());
println!(
    "99.9 latency percentile: {}",
    metrics.get_latency_percentile_ms(99.9).unwrap()
);
Ok(())
}
}