Start Entities Prototype

[tigrannajaryan]

Changes

• Added Producing Entity to the internal Resource representation.
• Made default Service detector produce a Resource with "service" entity type.
• Modified stdout exporters to include entity information in the output.
• Modified Resource.Merge() to use the new logic that takes the entity into account.
• Added resource.NewWithEntity() to allow creating resources with non-service producing entities.
• Updated OTLP exporters to include entity info in the Resource.

Results

Example output from namedtracer example (no code changes in the example itself) is below.

Note "Entity" under the "Resource".

{
        "Name": "Sub operation...",
        "SpanContext": {
                "TraceID": "0d5a05133e2546b3f78e2149d24da597",
                "SpanID": "6af308754cae0e4b",
                "TraceFlags": "01",
                "TraceState": "",
                "Remote": false
        },
        "Parent": {
                "TraceID": "0d5a05133e2546b3f78e2149d24da597",
                "SpanID": "70cd96e4d83b9e56",
                "TraceFlags": "01",
                "TraceState": "",
                "Remote": false
        },
        "SpanKind": 1,
        "StartTime": "2024-02-21T14:18:24.338284-05:00",
        "EndTime": "2024-02-21T14:18:24.338288458-05:00",
        "Attributes": [
                {
                        "Key": "ex.com/lemons",
                        "Value": {
                                "Type": "STRING",
                                "Value": "five"
                        }
                }
        ],
        "Events": [
                {
                        "Name": "Sub span event",
                        "Attributes": null,
                        "DroppedAttributeCount": 0,
                        "Time": "2024-02-21T14:18:24.338288-05:00"
                }
        ],
        "Links": null,
        "Status": {
                "Code": "Unset",
                "Description": ""
        },
        "DroppedAttributes": 0,
        "DroppedEvents": 0,
        "DroppedLinks": 0,
        "ChildSpanCount": 0,
        "Resource": {
                "Attributes": [
                        {
                                "Key": "service.name",
                                "Value": {
                                        "Type": "STRING",
                                        "Value": "unknown_service:___go_build_go_opentelemetry_io_otel_example_namedtracer"
                                }
                        },
                        {
                                "Key": "telemetry.sdk.language",
                                "Value": {
                                        "Type": "STRING",
                                        "Value": "go"
                                }
                        },
                        {
                                "Key": "telemetry.sdk.name",
                                "Value": {
                                        "Type": "STRING",
                                        "Value": "opentelemetry"
                                }
                        },
                        {
                                "Key": "telemetry.sdk.version",
                                "Value": {
                                        "Type": "STRING",
                                        "Value": "1.23.0-rc.1"
                                }
                        }
                ],
                "SchemaURL": "https://opentelemetry.io/schemas/1.24.0",
                "Entity": {
                        "Type": "service",
                        "Id": [
                                {
                                        "Key": "service.name",
                                        "Value": {
                                                "Type": "STRING",
                                                "Value": "unknown_service:___go_build_go_opentelemetry_io_otel_example_namedtracer"
                                        }
                                }
                        ]
                }
        },
        "InstrumentationLibrary": {
                "Name": "example/namedtracer/foo",
                "Version": "",
                "SchemaURL": ""
        }
}

[ocelotl]

The OTEP says the entity type must not be empty.