Crate tacho

A thread-safe, Future-aware metrics library.

Many programs need to information about runtime performance: the number of requests served, a distribution of request latency, the number of failures, the number of loop iterations, etc. tacho allows application code to record runtime information to a central Aggregator that merges data into a Report.

Performance

We found that the default (cryptographic) Hash algorithm adds a significant performance penalty, so the (non-cryptographic) RandomXxHashBuilder algorithm is used..

Labels are stored in a BTreeMap because they are used as hash keys and, therefore, need to implement Hash.

Modules

prometheus

Structs

Counter	Counts monotically.
Gauge	Captures an instantaneous value.
Key	Describes a metric.
ReportPeek
ReportTake
Reporter
Scope	Supports creation of scoped metrics.
Stat	Caputres a distribution of values.

Traits

Report
Timing

Functions

new	Creates a metrics registry.