+++ /dev/null
-# Exporting Metrics and Traces with OpenCensus, Zipkin, and Prometheus
-
-This tutorial provides a minimum example to verify that metrics and traces
-can be exported to OpenCensus from Go tools.
-
-## Setting up oragent
-
-1. Ensure you have [docker](https://www.docker.com/get-started) and [docker-compose](https://docs.docker.com/compose/install/).
-2. Clone [oragent](https://github.com/orijtech/oragent).
-3. In the oragent directory, start the services:
-```bash
-docker-compose up
-```
-If everything goes well, you should see output resembling the following:
-```
-Starting oragent_zipkin_1 ... done
-Starting oragent_oragent_1 ... done
-Starting oragent_prometheus_1 ... done
-...
-```
-* You can check the status of the OpenCensus agent using zPages at http://localhost:55679/debug/tracez.
-* You can now access the Prometheus UI at http://localhost:9445.
-* You can now access the Zipkin UI at http://localhost:9444.
-4. To shut down oragent, hit Ctrl+C in the terminal.
-5. You can also start oragent in detached mode by running `docker-compose up -d`. To stop oragent while detached, run `docker-compose down`.
-
-## Exporting Metrics and Traces
-1. Clone the [tools](https://golang.org/x/tools) subrepository.
-1. Inside `internal`, create a file named `main.go` with the following contents:
-```go
-package main
-
-import (
- "context"
- "fmt"
- "math/rand"
- "net/http"
- "time"
-
- "golang.org/x/tools/internal/event"
- "golang.org/x/tools/internal/event/export"
- "golang.org/x/tools/internal/event/export/metric"
- "golang.org/x/tools/internal/event/export/ocagent"
-)
-
-type testExporter struct {
- metrics metric.Exporter
- ocagent *ocagent.Exporter
-}
-
-func (e *testExporter) ProcessEvent(ctx context.Context, ev event.Event) (context.Context, event.Event) {
- ctx, ev = export.Tag(ctx, ev)
- ctx, ev = export.ContextSpan(ctx, ev)
- ctx, ev = e.metrics.ProcessEvent(ctx, ev)
- ctx, ev = e.ocagent.ProcessEvent(ctx, ev)
- return ctx, ev
-}
-
-func main() {
- exporter := &testExporter{}
-
- exporter.ocagent = ocagent.Connect(&ocagent.Config{
- Start: time.Now(),
- Address: "http://127.0.0.1:55678",
- Service: "go-tools-test",
- Rate: 5 * time.Second,
- Client: &http.Client{},
- })
- event.SetExporter(exporter)
-
- ctx := context.TODO()
- mLatency := event.NewFloat64Key("latency", "the latency in milliseconds")
- distribution := metric.HistogramFloat64Data{
- Info: &metric.HistogramFloat64{
- Name: "latencyDistribution",
- Description: "the various latencies",
- Buckets: []float64{0, 10, 50, 100, 200, 400, 800, 1000, 1400, 2000, 5000, 10000, 15000},
- },
- }
-
- distribution.Info.Record(&exporter.metrics, mLatency)
-
- for {
- sleep := randomSleep()
- _, end := event.StartSpan(ctx, "main.randomSleep()")
- time.Sleep(time.Duration(sleep) * time.Millisecond)
- end()
- event.Record(ctx, mLatency.Of(float64(sleep)))
-
- fmt.Println("Latency: ", float64(sleep))
- }
-}
-
-func randomSleep() int64 {
- var max int64
- switch modulus := time.Now().Unix() % 5; modulus {
- case 0:
- max = 17001
- case 1:
- max = 8007
- case 2:
- max = 917
- case 3:
- max = 87
- case 4:
- max = 1173
- }
- return rand.Int63n(max)
-}
-
-```
-3. Run the new file from within the tools repository:
-```bash
-go run internal/main.go
-```
-4. After about 5 seconds, OpenCensus should start receiving your new metrics, which you can see at http://localhost:8844/metrics. This page will look similar to the following:
-```
-# HELP promdemo_latencyDistribution the various latencies
-# TYPE promdemo_latencyDistribution histogram
-promdemo_latencyDistribution_bucket{vendor="otc",le="0"} 0
-promdemo_latencyDistribution_bucket{vendor="otc",le="10"} 2
-promdemo_latencyDistribution_bucket{vendor="otc",le="50"} 9
-promdemo_latencyDistribution_bucket{vendor="otc",le="100"} 22
-promdemo_latencyDistribution_bucket{vendor="otc",le="200"} 35
-promdemo_latencyDistribution_bucket{vendor="otc",le="400"} 49
-promdemo_latencyDistribution_bucket{vendor="otc",le="800"} 63
-promdemo_latencyDistribution_bucket{vendor="otc",le="1000"} 78
-promdemo_latencyDistribution_bucket{vendor="otc",le="1400"} 93
-promdemo_latencyDistribution_bucket{vendor="otc",le="2000"} 108
-promdemo_latencyDistribution_bucket{vendor="otc",le="5000"} 123
-promdemo_latencyDistribution_bucket{vendor="otc",le="10000"} 138
-promdemo_latencyDistribution_bucket{vendor="otc",le="15000"} 153
-promdemo_latencyDistribution_bucket{vendor="otc",le="+Inf"} 15
-promdemo_latencyDistribution_sum{vendor="otc"} 1641
-promdemo_latencyDistribution_count{vendor="otc"} 15
-```
-5. After a few more seconds, Prometheus should start displaying your new metrics. You can view the distribution at http://localhost:9445/graph?g0.range_input=5m&g0.stacked=1&g0.expr=rate(oragent_latencyDistribution_bucket%5B5m%5D)&g0.tab=0.
-
-6. Zipkin should also start displaying traces. You can view them at http://localhost:9444/zipkin/?limit=10&lookback=300000&serviceName=go-tools-test.
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