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bb24e8d578
* Report frontend metrics for js/css load time * Add FCP metric * Change comment * Simplify reporting frontend metrics
46 lines
1.7 KiB
Go
46 lines
1.7 KiB
Go
package metrics
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import "github.com/prometheus/client_golang/prometheus"
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// PostPostFrontendMetricsCommand sent by frontend to record frontend metrics
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type PostFrontendMetricsCommand struct {
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Events []FrontendMetricEvent `json:"events"`
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}
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// FrontendMetricEvent a single metric measurement event
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type FrontendMetricEvent struct {
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Name string `json:"name"`
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Value float64 `json:"value"`
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}
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// FrontendMetricsRecorder handles the recording of the event, ie passes it to a prometheus metric
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type FrontendMetricsRecorder func(event FrontendMetricEvent)
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// FrontendMetrics contains all the valid frontend metrics and a handler function for recording events
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var FrontendMetrics map[string]FrontendMetricsRecorder = map[string]FrontendMetricsRecorder{}
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func registerFrontendHistogram(name string, help string) {
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defBuckets := []float64{.1, .25, .5, 1, 1.5, 2, 5, 10, 20, 40}
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histogram := prometheus.NewHistogram(prometheus.HistogramOpts{
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Name: name,
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Help: help,
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Buckets: defBuckets,
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Namespace: ExporterName,
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})
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FrontendMetrics[name] = func(event FrontendMetricEvent) {
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histogram.Observe(event.Value)
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}
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prometheus.MustRegister(histogram)
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}
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func initFrontendMetrics() {
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registerFrontendHistogram("frontend_boot_load_time_seconds", "Frontend boot time measurement")
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registerFrontendHistogram("frontend_boot_first_paint_time_seconds", "Frontend boot first paint")
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registerFrontendHistogram("frontend_boot_first_contentful_paint_time_seconds", "Frontend boot first contentful paint")
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registerFrontendHistogram("frontend_boot_js_done_time_seconds", "Frontend boot initial js load")
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registerFrontendHistogram("frontend_boot_css_time_seconds", "Frontend boot initial css load")
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}
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