metrics.go

import (
  "go.opencensus.io/stats"
  "go.opencensus.io/tag"
  "go.opencensus.io/stats/view"
)

var (
  requestCounter             *stats.Float64Measure
  requestlatency             *stats.Float64Measure
  codeKey                    tag.Key
  DefaultLatencyDistribution = view.DistributionAggregation{0, 1, 2, 3, 4, 5, 6, 8, 10, 13, 16, 20, 25, 30, 40, 50, 65, 80, 100, 130, 160, 200, 250, 300, 400, 500, 650, 800, 1000, 2000, 5000, 10000, 20000, 50000, 100000}
)
	codeKey, _ = tag.NewKey("banias/keys/code")
	requestCounter, _ = stats.Float64("banias/measures/request_count", "Count of HTTP requests processed", stats.UnitNone)
	requestlatency, _ = stats.Float64("banias/measures/request_latency", "Latency distribution of HTTP requests", stats.UnitMilliseconds)
	view.Subscribe(
		&view.View{
			Name:        "request_count",
			Description: "Count of HTTP requests processed",
			TagKeys:     []tag.Key{codeKey},
			Measure:     requestCounter,
			Aggregation: view.CountAggregation{},
		})
	view.Subscribe(
		&view.View{
			Name:        "request_latency",
			Description: "Latency distribution of HTTP requests",
			TagKeys:     []tag.Key{codeKey},
			Measure:     requestlatency,
			Aggregation: DefaultLatencyDistribution,
		})

	view.SetReportingPeriod(1 * time.Second)