InfluxDB reporter for metrics


A node.js InfluxDB v0.9 and higher reporting backend for metrics. (Tested at least with InfluxDB 0.9 and 0.12.)

Installation

$ npm install metrics-influxdb

Usage

``javascript
"use strict";

var InfluxMetrics = require('metrics-influxdb');

var reporter = new InfluxMetrics.Reporter({ protocol: 'udp', tags: { 'server': 'one' } });
var c = new InfluxMetrics.Counter();
reporter.addMetric('test.counter', c);
c.inc();

var g = new InfluxMetrics.Gauge();
reporter.addMetric('test.gauge', g);
g.set(10);

var h = new InfluxMetrics.Histogram();
reporter.addMetric('test.histogram', h);
h.update(50);

var m = new InfluxMetrics.Meter();
reporter.addMetric('test.meter', m);
m.mark(1);

var t = new InfluxMetrics.Timer();
reporter.addMetric('test.timer', t);
t.update(50);

reporter.report(); // Send metrics to InfluxDB
reporter.report(false); // Force flush of all metrics in buffer

reporter.start(1000) // Schedule report to be run every 1000 ms (also available through options)
reporter.stop() // Stop scheduled reporter
`

Configuration

The options object accepts the following fields:

The udp protocol accepts the following additional options:


The http and https protocols accept the following additional options:


A more complex example

`javascript
const InfluxMetrics = require('metrics-influxdb');
const options = {
host: "my.influxdb.example.com",
port: 8086,
protocol: "http",
username: "the monitor",
password: "super sercret",
database: "app_metrics",
tags: {
app: "my-awesome-app",
environment: "production"
},
callback(error) {
if (error) {
console.log("Sending data to InfluxDB failed: ", error);
}
},
/* Given a key like "type=system.area=memory.metric=heapUsed"
* produce { type: "system", area: "memory", metric: "heapUsed" }
* so that these tags will be stored with the measure in InfluxDB
*/
tagger: (metricKey) => _.chain(metricKey.split("."))
.map((tagVal) => {
const [_str, key, val] = tagVal.match(/(\w+)=(.+)/) || [];
if (!key || !val) {
console.log(Expected format 'key=value[.key2=val2...]' but got the non-conforming part '${tagVal}'.);
return undefined;
}
else return [key, val];
})
.reject(_.isUndefined)
.zipObject()
/ Replace " ,=" - see https://docs.influxdata.com/influxdb/v0.13/write_protocols/write_syntax/#escaping-characters /
.mapValues((value) => value.replace(/([ ,=])/g, "\\$1");)
.value(),
namer: (metricKey, tags) => {
// We need a user-friendly name for the metrics ("measurements" in InfluxDB) that do not contain dots
// as Grafana seems to have issues with those
if (tags.type && tags.metric) {
return tags.type + "_" + tags.metric;
}
return metricKey;
},
metricReportedHook: (key, metric) => {
// Reset metrics as InfluxDB will do the aggregation and we should thus only send it new values
metric.clear();
},
fieldFilter: (key, metric, fieldName, fieldValue) => {
// Don't send unnecessary data to the DB to save CPU and disk space:
// don't send 0s (likely many, since we clear metrics after send) and
// various aggregated measures (percentiles etc.) since the DB will
// aggregate for us (well, as best as possible given 1 min-summarized data)
if (metric.type === "histogram") {
return metric.count > 0 && ["count", "min", "max", "mean", "median"].includes(fieldName);
}
if (metric.type === "timer") {
return metric.duration.count > 0 && ["count", "min", "max", "mean", "median"].includes(fieldName);
}
if (metric.type === "counter") {
return fieldValue > 0;
}
return true;
}
};

const reporter = new InfluxMetrics.Reporter(options);

const h = new InfluxMetrics.Histogram();
reporter.addMetric('type=system.area=memory.metric=heapUsed', c);
h.update(process.memoryUsage().heapUsed);

reporter.start(1000);
``

Credits

This module is based on metrics-influxdb by dropwizard.

License

The MIT License (MIT)

Copyright (c) 2015 Brandon Hamilton

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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SOFTWARE.