Blue Matador Metrics Client

Send StatsD-style custom metrics to your Blue Matador dashboard

Installation

• npm install blue-matador-metric-client

Setup

To start using the Blue Matador metrics client, simply require the package and call the init method.

const blueMatador = require('blue-matador-metrics-client');
const client = blueMatador.init();

Init

init([options])

options is an object with the following keys:

• host: (optional) specifies the host to send the custom metrics to. If no host is specified, localhost is the default host.
• port: (optional) specifies the port to send the custom metrics to. If no port is specified, 8767 is the default port.
• prefix: (optional) a string that will be prepended to the name of every metric you send. Cannot contain ':' or '|'

const blueMatador = require('blue-matador-metrics-client');
const options = {
  host: '127.0.0.1',
  port: 8767,
  prefix: 'app'
}
const client = blueMatador.init(options);

Note: The init function will detect if you have set BLUEMATADOR_AGENT_HOST and BLUEMATADOR_AGENT_PORT in the config file for your agent. Manually setting the host or port through the options object will override environmental variables.

Once you have an instance of the Blue Matador metrics client in your code you can start sending custom metrics. A Blue Matador agent must be configured to receive metrics at the destination host and port.

Gauge

gauge(name, value, [options])

• name: (required) The metric name e.g. 'myapp.request.size'. Cannot contain ':' or '|'
• value: (required) The latest value to set for the metric

options is an object with the following keys:

• sampleRate: (optional) sends only a sample of data e.g. 0.5 indicates 50% of data being sent. Default value is 1
• labels: (optional) adds metadata to a metric. Can be specified as object or array of strings with key-value pairs formatted with a colon separator e.g. ['account:12345'] or {account: 12345}. Cannot contain '#' or '|'

The gauge method is asynchronous and returns a Promise that can be chained on with .then() and .catch()

If the metric is successfully sent to the Blue Matador Agent the .then() response will return the metric that was sent.

const blueMatador = require('blue-matador-metrics-client');
const client = blueMatador.init();

const options = {
  sampleRate: 0.75,
  labels: { environment: 'Prod', account_id: 1232151 }
}

client.gauge('request.size', 32.25, options);

The following are all valid ways to send a gauge metric:

# gauge 100
client.gauge("request.size", 100);

# gauge 100 but sample 50%
client.gauge("request.size", 100, { sampleRate: 0.5 });

# gauge 100 with labels
client.gauge("request.size", 100, { labels: ["environment:Prod", "api"] });

# gauge 100, sample 50%, and send labels
client.gauge("request.size", 100, { sampleRate: 0.5, labels: ["environment:Prod", "api"] });

Count

count(name, options)

• name: (required) The metric name e.g. 'myapp.request.size'. Cannot contain ':' or '|'

options is an object with the following keys:

• value: (optional) the amount to increment the metric by, the default is 1.
• sampleRate: (optional) sends only a sample of data e.g. 0.5 indicates 50% of data being sent. Default value is 1
• labels: (optional) adds metadata to a metric. Can be specified as object or array of strings with key-value pairs formatted with a colon separator e.g. ['account:12345'] or {account: 12345}. Cannot contain '#' or '|'

The count method is asynchronous and returns a Promise that can be chained on with .then() and .catch()

If the metric is successfully sent to the Blue Matador Agent the .then() response will return the metric that was sent.

const blueMatador = require('blue-matador-metrics-client');
const client = blueMatador.init();

const options = {
  value: 1,
  sampleRate: 1,
  labels: { environment: 'Prod', account_id: 1232151 }
}

client.count('homepage.clicks', options)

The following are all valid ways to send a count metric:

# count 1
client.count("homepage.clicks");

# count 2
client.count("hompage.clicks", { value: 2 });

# count 1 but sample 50%
client.count("homepage.clicks", { value: 1, sampleRate: 0.5 });

# count 2 and send labels
client.count("homepage.clicks", { value: 2, labels: ["environment:Prod", "homepage"] });

# count 2, sample 50%, and send labels
client.count("homepage.clicks",{ value: 2, sampleRate: 0.5, labels: ["environment:Prod", "homepage"] });

Close

The close method should be called when shutting down your app.

client.close();

License

More details in LICENSE.

Copyright (c) 2020 Blue Matador, Inc.