Resources

Un recurso representa la entidad que produce telemetría como atributos de recurso. Por ejemplo, un proceso que produce telemetría y que se está ejecutando en un contenedor en Kubernetes tiene un nombre de un proceso, un nombre de pod, un namespace y, posiblemente, un nombre de despliegue. Los cuatro atributos pueden incluirse en el recurso.

En tu backend de observabilidad, puedes usar la información del recurso para investigar mejor un comportamiento interesante. Por ejemplo, si tus datos de trazas o métricas indican latencia en tu sistema, puedes reducirla a un contenedor, pod o despliegue de Kubernetes específico.

Resources should be assigned to a tracer, meter, and logger provider at its initialization, and are created much like attributes:

res := resource.NewWithAttributes(
    semconv.SchemaURL,
    semconv.ServiceNameKey.String("myService"),
    semconv.ServiceVersionKey.String("1.0.0"),
    semconv.ServiceInstanceIDKey.String("abcdef12345"),
)

provider := sdktrace.NewTracerProvider(
    ...
    sdktrace.WithResource(res),
)

Note the use of the semconv package to provide conventional names for resource attributes. This helps ensure that consumers of telemetry produced with these semantic conventions can easily discover relevant attributes and understand their meaning.

Resources can also be detected automatically through resource.Detector implementations. These Detectors may discover information about the currently running process, the operating system it is running on, the cloud provider hosting that operating system instance, or any number of other resource attributes.

res, err := resource.New(
	context.Background(),
	resource.WithFromEnv(),      // Discover and provide attributes from OTEL_RESOURCE_ATTRIBUTES and OTEL_SERVICE_NAME environment variables.
	resource.WithTelemetrySDK(), // Discover and provide information about the OpenTelemetry SDK used.
	resource.WithProcess(),      // Discover and provide process information.
	resource.WithOS(),           // Discover and provide OS information.
	resource.WithContainer(),    // Discover and provide container information.
	resource.WithHost(),         // Discover and provide host information.
	resource.WithAttributes(attribute.String("foo", "bar")), // Add custom resource attributes.
	// resource.WithDetectors(thirdparty.Detector{}), // Bring your own external Detector implementation.
)
if errors.Is(err, resource.ErrPartialResource) || errors.Is(err, resource.ErrSchemaURLConflict) {
	log.Println(err) // Log non-fatal issues.
} else if err != nil {
	log.Fatalln(err) // The error may be fatal.
}