This project provides real-time live charting of internal metrics for applications that use the rcrowley/go-metrics metrics library. It began as a fork of github.com/mkevac/debugcharts, until it seemed cleaner to keep it separate.

This is intended as a simple live view of metrics in a single process without the need for an entire metrics stack - it can be useful when developing and testing locally. All third party dependencies are loaded from a CDN to keep the amount of embedded data to a minimum.

The javascript code is written in ES6, so it requires a modern browser. It's been tested in Safari 10 and Chrome 54.

go get github.com/aalpern/go-metrics-charts

import "github.com/aalpern/go-metrics-charts"

metricscharts.Register()

You must have metrics exposed via expvars, as rather than having a binary depedency on the metrics package, the UI works by hitting the /debug/metrics JSON endpoint exposed by that package.

import "github.com/rcrowley/go-metrics/exp"

exp.Exp(metrics.DefaultRegistry)

The live charts page will be registered at /debug/metrics/charts.

• better handling of long list of metrics
• set refresh period
• limit the data to a rolling window of data points
• Chart options - add stacked area, display data points
• Responsive chart
• pause/restart
• merge runtime stats into metrics list for unified UI
• implement filtering of metrics list
• URL handling/generation