pub fn describe_metrics() -> Vec<(String, String, Vec<String>, &'static str)>Expand description
Returns the (name, help, labels, source) of every metric this crate
registers through a metric!-wrapping macro (lgalloc and rusage).
The metrics catalog (mz-metrics-catalog) builds the user-facing metrics
docs by scraping metric! invocations out of the source with syn. These
metrics are invisible to that scraper because their names are assembled at
macro-expansion time, so the catalog
imports them from here instead: it registers them into a throwaway registry
and reads their descriptors back out.