我想让Stackdriver Trace在新的Go 1.11 standard runtime on Google App Engine上工作。这仍然被标记为beta,所以也许它还没有完全奏效。但是,我跟着step-by-step directions,它没有工作。我(部分)完全按照链接中列出的代码部署了代码,并且我的跟踪是平的(即不包括我希望顶部的传入请求和嵌套在下面的传出请求的瀑布视图)。
示例代码
package main
import (
"fmt"
"log"
"net/http"
"os"
"contrib.go.opencensus.io/exporter/stackdriver"
"contrib.go.opencensus.io/exporter/stackdriver/propagation"
"go.opencensus.io/plugin/ochttp"
"go.opencensus.io/trace"
)
func main() {
// Create and register a OpenCensus Stackdriver Trace exporter.
exporter, err := stackdriver.NewExporter(stackdriver.Options{
ProjectID: os.Getenv("GOOGLE_CLOUD_PROJECT"),
})
if err != nil {
log.Fatal(err)
}
trace.RegisterExporter(exporter)
client := &http.Client{
Transport: &ochttp.Transport{
// Use Google Cloud propagation format.
Propagation: &propagation.HTTPFormat{},
},
}
handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
req, _ := http.NewRequest("GET", "https://www.google.com/robots.txt", nil)
// The trace ID from the incoming request will be
// propagated to the outgoing request.
req = req.WithContext(r.Context())
// The outgoing request will be traced with r's trace ID.
resp, err := client.Do(req)
if err != nil {
log.Fatal(err)
}
defer resp.Body.Close()
fmt.Fprint(w, "OK")
})
http.Handle("/foo", handler)
log.Fatal(http.ListenAndServe(":"+os.Getenv("PORT"), &ochttp.Handler{}))
}
如原始问题中的回复评论中所写,您可以尝试配置采样吗?:trace.AlwaysSample()
你可以在OpenCensus Trace documentation和godoc of OpenCensus Trace library找到一些关于采样率的评论:
默认情况下,将很少对跟踪进行采样。要更改整个程序的采样频率,请调用ApplyConfig。使用ProbabilitySampler对跟踪子集进行采样,或使用AlwaysSample在每次运行时收集跟踪: