Elide attributes from properties that have also been reported as tag?

[frigus02]

Currently opentelemetry-application-insights reports all attributes (span and resource attributes) as properties. This means that attributes that are mapped to tags are reported twice, e.g.:

• Attributes device.id and device.model.name:

  opentelemetry-application-insights/tests/http_requests.rs

  Lines 38 to 39 in 542e80b

  	KeyValue::new(semcov::resource::DEVICE_ID, "123"),
  	KeyValue::new(semcov::resource::DEVICE_MODEL_NAME, "device"),

• Reported as tags:

  opentelemetry-application-insights/tests/snapshots/http_requests__traces_simple.snap

  Lines 164 to 165 in 542e80b

  	"ai.device.id": "123",
  	"ai.device.model": "device",

• Also reported as properties:

  opentelemetry-application-insights/tests/snapshots/http_requests__traces_simple.snap

  Lines 138 to 139 in 542e80b

  	"device.id": "123",
  	"device.model.name": "device",

Advantages:

• Some tags have stricter length limitations. The property could report the full value while the tag would have a shorter one.
• Some tags are made up of multiple attributes, e.g. server.address + server.port form the Dependency Target. The properties still report the individual values.

Disadvantages:

• Sending data twice causes more network traffic and storage. Is the amount of data relevant or small enough that it doesn't matter?

Looks like the JS exporter elides some attributes: https://github.com/Azure/azure-sdk-for-js/blob/c66cad23c4b803719db65cb48a453b0adc13307b/sdk/monitor/monitor-opentelemetry-exporter/src/utils/spanUtils.ts#L108-L143