资源
A resource represents the entity producing telemetry as resource attributes. For example, a process producing telemetry that is running in a container on Kubernetes has a process name, a pod name, a namespace, and possibly a deployment name. All four of these attributes can be included in the resource.
In your observability backend, you can use resource information to better investigate interesting behavior. For example, if your trace or metrics data indicate latency in your system, you can narrow it down to a specific container, pod, or Kubernetes deployment.
设置
根据入门指南的说明进行操作，以确保您的.NET应用程序将数据导出到控制台。
使用环境变量添加资源
您可以使用OTEL_RESOURCE_ATTRIBUTES环境变量将资源注入到应用程序中。.NET SDK将自动检测这些资源。
以下示例通过环境变量添加了Service、Host和OS资源属性，通过运行类似uname的unix程序来生成资源数据。
$ env OTEL_RESOURCE_ATTRIBUTES="service.name=resource-tutorial-dotnet,service.namespace=tutorial,service.version=1.0,service.instance.id=`uuidgen`,host.name=`HOSTNAME`,host.type=`uname -m`,os.name=`uname -s`,os.version=`uname -r`" dotnet run
Activity.TraceId: d1cbb7787440cc95b325835cb2ff8018
Activity.SpanId: 2ca007300fcb3068
Activity.TraceFlags: Recorded
Activity.ActivitySourceName: tutorial-dotnet
Activity.DisplayName: SayHello
Activity.Kind: Internal
Activity.StartTime: 2022-10-02T13:31:12.0175090Z
Activity.Duration: 00:00:00.0003920
Activity.Tags:
foo: 1
bar: Hello, World!
baz: [1,2,3]
与 Activity 关联的资源:
service.name: resource-tutorial-dotnet
service.namespace: tutorial
service.version: 1.0
service.instance.id: 93B14BAD-813D-48EE-9FB1-2ADFD07C5E78
host.name: myhost
host.type: arm64
os.name: Darwin
os.version: 21.6.0
通过代码添加资源
您也可以通过将它们附加到ResourceBuilder来在代码中添加自定义资源。
以下示例基于入门指南示例，在代码中添加了两个自定义资源：environment.name和team.name。
using System.Diagnostics;
using System.Collections.Generic;
using OpenTelemetry;
using OpenTelemetry.Trace;
using OpenTelemetry.Resources;
var serviceName = "resource-tutorial-dotnet";
var serviceVersion = "1.0";
var resourceBuilder =
ResourceBuilder
.CreateDefault()
.AddService(serviceName: serviceName, serviceVersion: serviceVersion)
.AddAttributes(new Dictionary<string, object>
{
["environment.name"] = "production",
["team.name"] = "backend"
});
var sourceName = "tutorial-dotnet";
using var tracerProvider = Sdk.CreateTracerProviderBuilder()
.AddSource(sourceName)
.SetResourceBuilder(resourceBuilder)
.AddConsoleExporter()
.Build();
var MyActivitySource = new ActivitySource(sourceName);
using var activity = MyActivitySource.StartActivity("SayHello");
activity?.SetTag("foo", 1);
activity?.SetTag("bar", "Hello, World!");
activity?.SetTag("baz", new int[] { 1, 2, 3 });
在此示例中，service.name和service.version的值也在代码中设置。此外，service.instance.id获得了默认值。
如果您运行与使用环境变量添加资源中相同的命令，但是这次不包括service.name、service.version和service.instance.id，您将在资源列表中看到environment.name和team.name资源:
$ env OTEL_RESOURCE_ATTRIBUTES="service.namespace=tutorial,host.name=`HOSTNAME`,host.type=`uname -m`,os.name=`uname -s`,os.version=`uname -r`" dotnet run
Activity.TraceId: d1cbb7787440cc95b325835cb2ff8018
Activity.SpanId: 2ca007300fcb3068
Activity.TraceFlags: Recorded
Activity.ActivitySourceName: tutorial-dotnet
Activity.DisplayName: SayHello
Activity.Kind: Internal
Activity.StartTime: 2022-10-02T13:31:12.0175090Z
Activity.Duration: 00:00:00.0003920
Activity.Tags:
foo: 1
bar: Hello, World!
baz: [1,2,3]
与 Activity 关联的资源:
environment.name: production
team.name: backend
service.name: resource-tutorial-dotnet
service.namespace: tutorial
service.version: 1.0
service.instance.id: 28976A1C-BF02-43CA-BAE0-6E0564431462
host.name: pcarter
host.type: arm64
os.name: Darwin
os.version: 21.6.0
注意: 如果同时使用环境变量和代码设置资源属性，则代码中的值优先生效。
下一步
您可以为配置添加更多资源探测器，例如获取有关Cloud环境或Deployment的详细信息。