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restic/vendor/contrib.go.opencensus.io/exporter/ocagent/README.md

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# OpenCensus Agent Go Exporter
[![Build Status][travis-image]][travis-url] [![GoDoc][godoc-image]][godoc-url]
This repository contains the Go implementation of the OpenCensus Agent (OC-Agent) Exporter.
OC-Agent is a deamon process running in a VM that can retrieve spans/stats/metrics from
OpenCensus Library, export them to other backends and possibly push configurations back to
Library. See more details on [OC-Agent Readme][OCAgentReadme].
Note: This is an experimental repository and is likely to get backwards-incompatible changes.
Ultimately we may want to move the OC-Agent Go Exporter to [OpenCensus Go core library][OpenCensusGo].
## Installation
```bash
$ go get -u contrib.go.opencensus.io/exporter/ocagent
```
## Usage
```go
import (
"context"
"fmt"
"log"
"time"
"contrib.go.opencensus.io/exporter/ocagent"
"go.opencensus.io/trace"
)
func Example() {
exp, err := ocagent.NewExporter(ocagent.WithInsecure(), ocagent.WithServiceName("your-service-name"))
if err != nil {
log.Fatalf("Failed to create the agent exporter: %v", err)
}
defer exp.Stop()
// Now register it as a trace exporter.
trace.RegisterExporter(exp)
// Then use the OpenCensus tracing library, like we normally would.
ctx, span := trace.StartSpan(context.Background(), "AgentExporter-Example")
defer span.End()
for i := 0; i < 10; i++ {
_, iSpan := trace.StartSpan(ctx, fmt.Sprintf("Sample-%d", i))
<-time.After(6 * time.Millisecond)
iSpan.End()
}
}
```
[OCAgentReadme]: https://github.com/census-instrumentation/opencensus-proto/tree/master/opencensus/proto/agent#opencensus-agent-proto
[OpenCensusGo]: https://github.com/census-instrumentation/opencensus-go
[godoc-image]: https://godoc.org/contrib.go.opencensus.io/exporter/ocagent?status.svg
[godoc-url]: https://godoc.org/contrib.go.opencensus.io/exporter/ocagent
[travis-image]: https://travis-ci.org/census-ecosystem/opencensus-go-exporter-ocagent.svg?branch=master
[travis-url]: https://travis-ci.org/census-ecosystem/opencensus-go-exporter-ocagent