Resources
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リソースは、リソース属性としてテレメトリーを生成するエンティティを表します。 たとえば、Kubernetes上のコンテナで実行されているテレメトリーを生成するプロセスは、プロセス名、ポッド名、ネームスペース、および場合によってはデプロイメント名を持ちます。 これらの4つの属性すべてをリソースに含まれることができます。
オブザーバビリティバックエンドでは、リソース情報を使用して興味深い動作をより詳細に調査できます。 たとえば、トレースまたはメトリクスデータがシステムのレイテンシーを示している場合、それを特定のコンテナ、ポッド、またはKubernetesデプロイメントに絞り込むことができます。
Setup
Follow the instructions in the Getting Started, so that you have a running .NET app exporting data to the console.
Adding resources with environment variables
You can use the OTEL_RESOURCE_ATTRIBUTES environment variable to inject
resources into your application. The .NET SDK will automatically detect these
resources.
The following example adds Service, Host and OS resource attributes
via environment variables, running unix programs like uname to generate the
resource data.
$ 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]
Resource associated with Activity:
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
Adding resources in code
You can also add custom resources in code by attaching them to a
ResourceBuilder.
The following example builds on the getting started sample and adds two custom
resources, environment.name and team.name in code:
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 });
In this example, the service.name and service.version values are set in code
as well. Additionally, service.instance.id gets a default value.
If you run the same command as in
Adding resources with environment variables,
but this time without service.name service.version, and
service.instance.id, you’ll see the environment.name and team.name
resources in the resource list:
$ 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]
Resource associated with Activity:
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
Note: If you set resource attributes with both environment variables and code, the values in code take precedence.
Next steps
There are more resource detectors you can add to your configuration, for example to get details about your Cloud environment or Deployment.
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