strigo-node-metrics

A NodeJS metrics instrumentation library for Strigo.

This is a very light abstraction on top of hot-shots, which provides not only a statsd client, but also emits additional process level metrics. See hot-shots for reference.

Installation

Add "@strigo/node-metrics": "strigo/strigo-node-metrics.git#TAG" to your package.json.

Usage

import { setupStatsdClient } from '@strigo/node-metrics;

// Initialize client for specific service (will add a statsd tag service=sam to each metric).
// This returns an unabstracted hot-shots client.
statsd = setupStatsdClient({ svc: SERVICE_NAME, env: 'prod' port: 8125 });

statsd.increment('http_requests_total', { org_name });

Metrics

Metrics are emitted in Etsy's statsd format, with the addition of tags (dimensions).

Configuration

setupStatsdClient receives the following in an object:

• svc -> The name of the service to add as a prefix.
• env -> The environment in which the process is running.
• host -> The host to emit metrics to (defaults to 127.0.0.1).
• port -> The port to emit metrics to (defaults to 8125).
• log -> The node logger instance.

Built-in Labels

• env is appended as a label to each metrics (as env=env).
• container_hostname is appended as a label to each metrics (as container_hostname=HOSTNAME) if running inside a container.
• nomad_alloc_id is appended as a label to each metrics (as nomad_alloc_id=NOMAD_ALLOC_ID) if running inside a container.

Note that container_hostname is not configurable. When not running inside a container, its value will be null.

Example Output

• Counter -> http_requests_total,x=1,env=prod:1|c
• Timer -> http_request_duration_ms,env=prod:120|ms
• Gauge -> my_gauge,env=prod:15|g

Manual Test

You can see if metrics are being emitted by running the client and listening on localhost 8125 UDP.

On Unix: nc -ul -p STATSD_PORT.

On OS X: nc -ul STATSD_PORT.

You can run node ./test/manual.js to run the aforementioned example.