Resources

资源以资源属性的形式表示产生遥测数据的实体。例如， 进程 产生的遥测数据运行在 Kubernetes 的容器中，那么它会具有 进程 的名称、Pod 名称、命名空间，可能还有部署名称。这四个属性都可以包含在资源中。

在你的可观测性后端中，你可以使用资源信息来更好地调查异常行为。例如， 如果你的追踪或指标数据表明系统中存在延迟，你可以将问题定位到特定的容器、Pod 或 Kubernetes 部署上。

Resource Detection

The PHP SDK detects resources from a variety of sources, and by default will use all available resource detectors:

• environment (OTEL_RESOURCE_ATTRIBUTES, OTEL_SERVICE_NAME)
• host information
• host operating system
• current process
• runtime

Disabling resource detection

By default, all SDK resource detectors are used, but you can use the environment variable OTEL_PHP_DETECTORS to enable only certain detectors, or completely disable them:

• env
• host
• os
• process
• process_runtime
• sdk
• sdk_provided
• all - enable all resource detectors
• none - disable resource detection

For example, to enable only the env, host and sdk detectors:

env OTEL_PHP_DETECTORS=env,host,sdk \ php example.php 

Custom resource detectors

Resource detectors for generic platforms or vendor-specific environments can be installed as composer packages.

For example, to install and enable the container resource detector:

composer require open-telemetry/detector-container env OTEL_PHP_RESOURCE_DETECTORS=container \ php example.php 

Note that installed detectors are automatically included in the default all resource detector list.

Adding resources with environment variables

If there is not an SDK detector for the resource you need, you can add arbitrary resources via the OTEL_RESOURCE_ATTRIBUTES environment variable, which is interpreted by the env detector. This variable takes a comma-separated list of key=value pairs, for example:

env OTEL_RESOURCE_ATTRIBUTES="service.name=my_service,service.namespace=demo,service.version=1.0,deployment.environment=development" \ php example.php 

Adding resources in code

Custom resources can also be configured in your code. Here, the default resources (detected as described above) are merged with custom resources. The resources are then passed to the tracer provider, where they will be associated with all generated spans.

$resource = ResourceInfoFactory::defaultResource()->merge(ResourceInfo::create(Attributes::create([  ResourceAttributes::SERVICE_NAMESPACE => 'foo',  ResourceAttributes::SERVICE_NAME => 'bar',  ResourceAttributes::SERVICE_INSTANCE_ID => 1,  ResourceAttributes::SERVICE_VERSION => '0.1',  ResourceAttributes::DEPLOYMENT_ENVIRONMENT_NAME => 'development', ])));  $tracerProvider = new TracerProvider(  new SimpleSpanProcessor(  (new ConsoleSpanExporterFactory())->create()  ),  null,  $resource );