使用OpenCensus时无法获取自定义指标数据

问题描述

我正在遵循本指南monitoring_opencensus_metrics_quickstart-go。此外，我还尝试了使用此answer的方法。

代码在这里：

package main

import (
    "context"
    "fmt"
    "log"
    "os"
    "path"
    "time"

    "google.golang.org/apI/Option"

    "contrib.go.opencensus.io/exporter/stackdriver"
    "go.opencensus.io/stats"
    "go.opencensus.io/stats/view"
    "golang.org/x/exp/rand"
)

var (
    // The task latency in milliseconds.
    latencyMs = stats.Float64("task_latency","The task latency in milliseconds","ms")
)

func main() {
    ctx := context.Background()
    v := &view.View{
        Name:        "task_latency_distribution",Measure:     latencyMs,Description: "The distribution of the task latencies",Aggregation: view.distribution(0,100,200,400,1000,2000,4000),}
    if err := view.Register(v); err != nil {
        log.Fatalf("Failed to register the view: %v",err)
    }

    exporter,err := stackdriver.NewExporter(stackdriver.Options{
        ProjectID: os.Getenv("GOOGLE_CLOUD_PROJECT"),MonitoringClientOptions: []option.ClientOption{
            option.WithCredentialsFile(path.Join("./.gcp/stackdriver-monitor-admin.json")),},})
    if err != nil {
        log.Fatal(err)
    }
    view.RegisterExporter(exporter)
    view.SetReportingPeriod(60 * time.Second)
    // Flush must be called before main() exits to ensure metrics are recorded.
    defer exporter.Flush()

    if err := exporter.StartMetricsExporter(); err != nil {
        log.Fatalf("Error starting metric exporter: %v",err)
    }
    defer exporter.StopMetricsExporter()

    // Record 100 fake latency values between 0 and 5 seconds.
    for i := 0; i < 100; i++ {
        ms := float64(5*time.Second/time.Millisecond) * rand.Float64()
        fmt.Printf("Latency %d: %f\n",i,ms)
        stats.Record(ctx,latencyMs.M(ms))
        time.Sleep(1 * time.Second)
    }

    fmt.Println("Done recording metrics")
}

我在本地运行以上代码，而不是在GCE，GAE和GKE环境中运行。

在指标浏览器的Web UI中，这是指标查询条件：

• 资源类型：Consumed API
• 指标：custom.googleapis.com/opencensus/task_latency_distribution

完整查询：

fetch consumed_api
| metric 'custom.googleapis.com/opencensus/task_latency_distribution'
| align delta(1m)
| every 1m
| group_by [],[value_task_latency_distribution_aggregate:
       aggregate(value.task_latency_distribution)]

服务帐户具有Monitoring Admin角色。

但是得到了No data is available for the selected time frame。

解决方法

它对我有用，但我倾向于做一些稍微不同的事情：

• export GOOGLE_APPLICATION_CREDENTIALS=path/to/creds而不是MonitoringClientOptions{};
• 以前（！？）我在使用0桶分配时遇到问题；尝试删除该初始（0）存储桶，然后重试；
• 从指标浏览器中删除resource.type；来自API Explorer，如果有的话，则应为global

Google APIs Explorer是诊断Stackdriver API挑战的绝佳方法。您可以使用它列出指标并列出时间序列（替换your-project-id并更新2个interval值）：

https://cloud.google.com/monitoring/api/ref_v3/rest/v3/projects.metricDescriptors/list?apix=true&apix_params=%7B%22name%22%3A%22projects%2Fyour-project-id%22%2C%22filter%22%3A%22metric.type%3D%5C%22custom.googleapis.com%2Fopencensus%2Ftask_latency_distribution%5C%22%22%7D

https://cloud.google.com/monitoring/api/ref_v3/rest/v3/projects.timeSeries/list?apix=true&apix_params=%7B%22name%22%3A%22projects%2Fyour-project-id%22%2C%22aggregation.alignmentPeriod%22%3A%22%2B300s%22%2C%22aggregation.crossSeriesReducer%22%3A%22REDUCE_MEAN%22%2C%22aggregation.perSeriesAligner%22%3A%22ALIGN_DELTA%22%2C%22filter%22%3A%22metric.type%3D%5C%22custom.googleapis.com%2Fopencensus%2Ftask_latency_distribution%5C%22%22%2C%22interval.endTime%22%3A%222020-09-08T23%3A59%3A59Z%22%2C%22interval.startTime%22%3A%222020-09-08T00%3A00%3A00Z%22%7D

使用Chrome的开发者控制台，您可以找到Stackdriver对该API的调用之一，以便更轻松地重现该API，例如

filter: metric.type="custom.googleapis.com/opencensus/task_latency_distribution"
aggregation.crossSeriesReducer: REDUCE_MEAN
aggregation.alignmentPeriod: +60s
aggregation.perSeriesAligner: ALIGN_DELTA
secondaryAggregation.crossSeriesReducer: REDUCE_NONE
interval.startTime: 2020-09-08T23:59:59Z
interval.endTime: 2020-09-08T00:00:00Z