Function explain 

pub fn explain(query: &MonitorQuery) -> String

Produce a one-paragraph, plain-language summary of a parsed query.

Examples

use ddquery_core::{explain, parse};

let q = parse("avg(last_5m):avg:system.cpu.user{env:prod} > 90").unwrap();
let text = explain(&q);
assert!(text.contains("system.cpu.user"));