You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: stats.rs
    path of file: ./repos/holochain-rust/crates/metrics/src
    
    the code of the file until where you have to start completion: /// Provides statistical features over metric data.
/// Extends the metric api with statistical aggregation functions
use crate::metrics::Metric;
use num_traits::float::Float;
use stats::Commute;
use std::{
    collections::HashMap,
    error::Error,
    fmt,
    fmt::{Display, Formatter},
    io,
    iter::FromIterator,
};

use holochain_tracing_macros::newrelic_autotrace;
use regex::Regex;

/// Generic representation of descriptive statistics.
pub trait DescriptiveStats {
    fn max(&self) -> f64;
    fn min(&self)
    
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        for (stat_name, stat_result) in self.iter() {
            match stat_result {
                Ok(_checked_stat) => {
                    writeln!(f, "Checking {} metric... ok!", stat_name)?;
                }
                Err((_checked_stat, stat_failures)) => {
                    writeln!(f, "Checking {} metric... failed!", stat_name)?;
                    for stat_failure in stat_failures {
                        writeln!(f, "\t{}", stat_failure)?;
                    }
                }
            }
        }
        Ok(())
    }