statman

statman is a set of modules to assist with collection of metrics

Supported metrics

• gauge: represents a point in time measurement
• meter: measures flow, including count and average time
• stopwatch: used to record timings

Install it!

statman is decomposed into several smaller modules. To utilize the metric modules, you have two choices

• access directly: this is recommended if there is one single metric package. Like if you just want the stopwatch
• access via statman: this provides some capabilities such as a registry to easily access many metrics

Option 1: access directly

Install using npm:

npm install statman-stopwatch

Reference in your app:

var Gauge = require('statman-stopwatch');
var gauge = Gauge('gauge-name');

Option 2: access from statman

Install using npm:

npm install statman

Reference in your app:

var statman = require('statman');
var gauge = new statman.Gauge('gauge-name');

Use it!

Registry

statman provides a registry that allow for you to track your metrics.

You can manually add metrics to the registry. For the built in metrics, you can also auto-register those while creating

// register a metric with a key
var metric = { ..some object.. }
statman.register('my metric name', metric)

// register a metric with implicit key = name
var metric2 = { name: 'my second metric' ..some object.. }
statman.register(metric2);

// access metric from registry
statman.registry('my metric name') //return metric

Gauge

For the capabilities of gauge see: https://github.com/jasonray/statman-gauge

The following two approaches are equivalent

Explicit creation of gauge

var gauge = statman.gauge('metric-name');
statman.regiser(gauge);
gauge.set(5);

Create and register a gauge

statman.gauge('metric-name').set(5);   //if gauge by name 'metric-name' does not exist, create one, and set to '5'
statman.gauge('metric-name').value()   //return '5'

Meter

meter

Stopwatch

stopwatch

Extend it!

TODO: how to build a new metric

Build it!

• Make sure that you have node and npm installed
• Clone source code to you local machine
• Setup dependencies: npm install
• run tests: npm test

Roadmap

• Add meter
• Move stopwatch back to its own repo. Sigh.
• Create reporters to output metrics
• Provide guidance how to hook with HTTP/TCP/async calls
• Provide hook to register with express
• Integrate with visualizations
• Provide web interface to access metrics