Add container labels field from ECS (#125)

Co-authored-by: Alexander Wert <AlexanderWert@users.noreply.github.com>
Co-authored-by: Joao Grassi <joao.grassi@dynatrace.com>

CHANGELOG.md

@@ -9,6 +9,8 @@ release.
 
 - Adds `session.id` and session.md to general docs and model
 ([#215](https://github.com/open-telemetry/semantic-conventions/pull/215))
+- Add `container.labels.<key>` attributes.
+  ([#125](https://github.com/open-telemetry/semantic-conventions/pull/125))
 - Add `cluster.name` and `node.name` attributes to Elasticsearch semantic conventions.
   ([#285](https://github.com/open-telemetry/semantic-conventions/pull/285))
 - Fix the unit of metric.process.runtime.jvm.system.cpu.load_1m to be {run_queue_item}

docs/resource/container.md

@@ -19,6 +19,7 @@
 | `container.command` | string | The command used to run the container (i.e. the command name). [3] | `otelcontribcol` | Opt-In |
 | `container.command_line` | string | The full command run by the container as a single string representing the full command. [2] | `otelcontribcol --config config.yaml` | Opt-In |
 | `container.command_args` | string[] | All the command arguments (including the command/executable itself) run by the container. [2] | `[otelcontribcol, --config, config.yaml]` | Opt-In |
+| `container.labels.<key>` | string | Container labels, `<key>` being the label name, the value being the label value. | `container.labels.app=nginx` | Recommended |
 
 **[1]:** Docker defines a sha256 of the image id; `container.image.id` corresponds to the `Image` field from the Docker container inspect [API](https://docs.docker.com/engine/api/v1.43/#tag/Container/operation/ContainerInspect) endpoint.
 K8s defines a link to the container registry repository with digest `"imageID": "registry.azurecr.io /namespace/service/dockerfile@sha256:bdeabd40c3a8a492eaf9e8e44d0ebbb84bac7ee25ac0cf8a7159d25f62555625"`.

model/resource/container.yaml

@@ -82,3 +82,8 @@ groups:
         brief: >
           All the command arguments (including the command/executable itself) run by the container. [2]
         examples: [ 'otelcontribcol, --config, config.yaml' ]
+      - id: labels
+        type: template[string]
+        brief: >
+          Container labels, `<key>` being the label name, the value being the label value.
+        examples: [ 'container.labels.app=nginx' ]