Security News
OpenJS: “XZ Utils Cyberattack Likely Not an Isolated Incident”
OpenJS is warning of social engineering takeovers targeting open source projects after receiving a credible attempt on the foundation.
@opencensus/core
Advanced tools
Weekly downloads
Package description
The @opencensus/core package is a set of libraries for collecting, processing, and exporting telemetry data (metrics and traces) for analysis to improve the performance and reliability of applications. It is part of the OpenCensus project, which aims to provide a single, high-quality telemetry collection framework across multiple languages.
Tracing
This feature allows the collection and export of trace data, which helps in understanding the flow of requests through various services and in identifying bottlenecks and latency issues.
const { Tracing } = require('@opencensus/core');
const tracing = Tracing.instance;
// Configure tracing
tracing.start({samplingRate: 1});
// Create a custom span
const rootSpan = tracing.tracer.startRootSpan({name: 'main'}, rootSpan => {
// Do work within the span
rootSpan.end(); // End the span
});
Metrics
This feature enables the collection and aggregation of metrics data, such as counts or latencies, which can be used for monitoring application performance and health.
const { Metrics, MeasureUnit } = require('@opencensus/core');
const metrics = Metrics.instance;
// Create a measure
const requestCountMeasure = metrics.createMeasureInt64('request_count', MeasureUnit.UNIT, 'Count of requests received');
// Create and register a view to aggregate the data
metrics.createView('request_count_view', requestCountMeasure, 'count', [], 'The count of requests', []);
// Record data
metrics.record([{measure: requestCountMeasure, value: 1}]);
OpenTelemetry is the successor to OpenCensus and provides a single set of APIs, libraries, agents, and instrumentation to capture distributed traces and metrics from your application. It aims to make telemetry data (metrics, logs, and traces) a built-in feature of cloud-native software applications. Compared to @opencensus/core, OpenTelemetry offers broader community support and more active development, with a focus on compatibility and integration with a wide range of observability tools.
The prom-client package is specifically designed for creating metrics in the Prometheus format. It focuses solely on metrics collection and exposition, unlike @opencensus/core, which supports both tracing and metrics. This makes prom-client a good choice if you are specifically looking for Prometheus support, but it lacks the tracing capabilities of @opencensus/core.
Zipkin-js is a library for sending traces to Zipkin, a distributed tracing system. It focuses on tracing support and integrates with various JavaScript frameworks and libraries. Compared to @opencensus/core, zipkin-js is more specialized in tracing and does not include metrics collection functionality. It's a good option if your primary need is distributed tracing with Zipkin.
Readme
OpenCensus for Node.js is an implementation of OpenCensus, a toolkit for collecting application performance and behavior monitoring data. It currently includes 3 apis: stats, tracing and tags.
The library is in alpha stage and the API is subject to change.
Install the opencensus-core package with NPM:
npm install @opencensus/core
To enable metrics, we’ll import a few items from OpenCensus Core package.
const { globalStats, MeasureUnit, AggregationType, TagMap } = require('@opencensus/core');
// The latency in milliseconds
const mLatencyMs = globalStats.createMeasureDouble(
"repl/latency",
MeasureUnit.MS,
"The latency in milliseconds"
);
We now determine how our metrics will be organized by creating Views
. We will also create the variable needed to add extra text meta-data to our metrics – methodTagKey
, statusTagKey
, and errorTagKey
.
const methodTagKey = { name: "method" };
const statusTagKey = { name: "status" };
const errorTagKey = { name: "error" };
// Create & Register the view.
const latencyView = globalStats.createView(
"demo/latency",
mLatencyMs,
AggregationType.DISTRIBUTION,
[methodTagKey, statusTagKey, errorTagKey],
"The distribution of the latencies",
// Bucket Boundaries:
// [>=0ms, >=25ms, >=50ms, >=75ms, >=100ms, >=200ms, >=400ms, >=600ms, >=800ms, >=1s, >=2s, >=4s, >=6s]
[0, 25, 50, 75, 100, 200, 400, 600, 800, 1000, 2000, 4000, 6000]
);
globalStats.registerView(latencyView);
Now we will record the desired metrics. To do so, we will use globalStats.record()
and pass in measurements.
const [_, startNanoseconds] = process.hrtime();
const tags = new TagMap();
tags.set(methodTagKey, { value: "REPL" });
tags.set(statusTagKey, { value: "OK" });
globalStats.record([{
measure: mLatencyMs,
value: sinceInMilliseconds(startNanoseconds)
}], tags);
function sinceInMilliseconds(startNanoseconds) {
const [_, endNanoseconds] = process.hrtime();
return (endNanoseconds - startNanoseconds) / 1e6;
}
Measures can be of type Int64
or DOUBLE
, created by calling createMeasureInt64
and createMeasureDouble
respectively. Its units can be:
MeasureUnit | Usage |
---|---|
UNIT | for general counts |
BYTE | bytes |
KBYTE | Kbytes |
SEC | seconds |
MS | millisecond |
NS | nanosecond |
Views can have agregations of type SUM
, LAST_VALUE
, COUNT
and DISTRIBUTION
. To know more about Stats core concepts, please visit: https://opencensus.io/core-concepts/metrics/
See Quickstart/Metrics for a full example of registering and collecting metrics.
Apache License 2.0
FAQs
OpenCensus is a toolkit for collecting application performance and behavior data.
The npm package @opencensus/core receives a total of 1,655,298 weekly downloads. As such, @opencensus/core popularity was classified as popular.
We found that @opencensus/core demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 6 open source maintainers collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
OpenJS is warning of social engineering takeovers targeting open source projects after receiving a credible attempt on the foundation.
Company News
Come meet the Socket team at BSidesSF and RSA! We're sponsoring several fun networking events and we would love to see you there.
Security News
OSI is starting a conversation aimed at removing the excuse of the SaaS loophole for companies navigating licensing and the complexities of doing business with open source.