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@zaplabs/opencensus-core
Advanced tools
Zaplabs - OpenCensus is a toolkit for collecting application performance and behavior data.
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
0.0.14 - 2019-06-04
FAQs
Zaplabs - OpenCensus is a toolkit for collecting application performance and behavior data.
The npm package @zaplabs/opencensus-core receives a total of 0 weekly downloads. As such, @zaplabs/opencensus-core popularity was classified as not popular.
We found that @zaplabs/opencensus-core demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 26 open source maintainers collaborating on the project.
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