logzio-nodejs-metrics-sdk

Logz.io nodejs metrics sdk

This topic includes instructions on how to send custom metrics to Logz.io from your Node.js application.

The included example uses the OpenTelemetry JS SDK and its based on OpenTelemetry exporter collector proto.

Before you begin, you'll need:
Node 14 or higher

Note This project works best with logzio as metrics backend, but its compatible with all backends that support prometheuesrmotewrite format

Quick start

Install the package:

``
npm install logzio-nodejs-metrics-sdk@0.4.0
npm install @opentelemetry/sdk-metrics-base@0.27.0
`

Set the variables in the following code snippet:

| Environment variable | Description |
| -------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| url | The Logz.io Listener URL for for your region, configured to use port 8052 for http traffic, or port 8053 for https traffic. For example - https://listener.logz.io:8053 |
| token | Your Logz.io Prometheus Metrics account token. |

`js
const { MeterProvider, PeriodicExportingMetricReader } = require('@opentelemetry/sdk-metrics');
const sdk = require('logzio-nodejs-metrics-sdk');

const collectorOptions = {
url: '<>',
headers: {
Authorization: 'Bearer <>',
},
};
// Initialize the exporter
const metricExporter = new sdk.RemoteWriteExporter(collectorOptions);

// Initialize the meter provider
const meter = new MeterProvider({
readers: [
new PeriodicExportingMetricReader(
{
exporter: metricExporter,
exportIntervalMillis: 1000
})
],
}).getMeter('example-exporter');

// Create your first counter metric
const requestCounter = meter.createCounter('Counter', {
description: 'Example of a Counter',
});
// Define some labels for your metrics
const labels = { environment: 'prod' };
// Record some value
requestCounter.add(1, labels);
// In logzio Metrics you will see the following metric:
// Counter_total{environment: 'prod'} 1.0
`

$3

For more information, see the OpenTelemetry documentation.

| Name | Behavior |
| ------------- | ---------------------------------------------------------------------------------------------------------------------- |
| Counter | Metric value can only go up or be reset to 0, calculated per counter.Add(context,value,labels) request. |
| UpDownCounter | Metric value can arbitrarily increment or decrement, calculated per updowncounter.Add(context,value,labels) request. |
| Histogram | Metric values captured by the histogram.Record(context,value,labels) function, calculated per request. |

$3

First Initialize the exporter and meter provider:

`js
const { MeterProvider, PeriodicExportingMetricReader } = require('@opentelemetry/sdk-metrics');
const sdk = require('logzio-nodejs-metrics-sdk');

const collectorOptions = {
url: '<>',
headers: {
Authorization: 'Bearer <>',
},
};
// Initialize the exporter
const metricExporter = new sdk.RemoteWriteExporter(collectorOptions);

// Initialize the meter provider
const meter = new MeterProvider({
readers: [
new PeriodicExportingMetricReader(
{
exporter: metricExporter,
exportIntervalMillis: 1000
})
],
}).getMeter('example-exporter');
`

Then create different types of metrics

#### UpDownCounter:

`js
// Create UpDownCounter metric
const upDownCounter = meter.createUpDownCounter('UpDownCounter', {
description: 'Example of a UpDownCounter',
});
// Define some labels for your metrics
const labels = { environment: 'prod' };
// Record some values
upDownCounter.add(5, labels);
upDownCounter.add(-1, labels);
// In logzio you will see the following metric:
// UpDownCounter{environment: 'prod'} 4.0
`

#### Histogram:

`js
// Create ValueRecorder metric
const histogram = meter.createHistogram('test_histogram', {
description: 'Example of a histogram',
});
// Define some labels for your metrics
const labels = { environment: 'prod' };
// Record some values
histogram.record(30, labels);
histogram.record(20), labels;
// In logzio you will see the following metrics:
// test_histogram_sum{environment: 'prod'} 50.0
// test_histogram_count{environment: 'prod'} 2.0
// test_histogram_avg{environment: 'prod'} 25.0
`

Update log

Breaking changes:
- Update dependencies versions
- Upgrade to OTEL packages in version 1.26.0
- Update docs
- Drop support for Nodejs 12.*

0.4.0

Breaking changes:
- Drop support for Nodejs 8. 10.

Changelog:
- Fix bug which makes it crash if no metrics created/written before the first interval (@chapost1)
- Using axios instead of requestretry` (@chapost1)

0.3.0

- Add github action for auto publish to npm
- Add option to update TimeUnixNano in metrics from Exporter

0.2.0

- Update otel dependencies and naming conventions
- Update docs
- Fix exporting modules names

0.1.0

- Initial Release