Add container.restart_count Resource attribute

This change adds a Resource attribute to represent number of container restarts. This is can be used in k8s logs collection to identify a particular container instance, where the number of container restarts is a part of a log file path.

CHANGELOG.md

@@ -48,6 +48,8 @@ release.
   ([#1810](https://github.com/open-telemetry/opentelemetry-specification/pull/1810))
 - Clarifications for `http.client_ip` and `http.host`.
   ([#1890](https://github.com/open-telemetry/opentelemetry-specification/pull/1890))
+- Add `container.restart_count` Resource attribute.
+  ([#1945](https://github.com/open-telemetry/opentelemetry-specification/pull/1945))
 
 ### Compatibility
 

semantic_conventions/resource/container.yaml

@@ -31,3 +31,8 @@ groups:
         brief: >
           Container image tag.
         examples: ['0.1']
+      - id: restart_count
+        type: int
+        brief: >
+          Number of times the container was restarted by container orchestrator.
+        examples: [0, 2]

specification/resource/semantic_conventions/container.md

@@ -14,4 +14,5 @@
 | `container.runtime` | string | The container runtime managing this container. | `docker`; `containerd`; `rkt` | No |
 | `container.image.name` | string | Name of the image the container was built on. | `gcr.io/opentelemetry/operator` | No |
 | `container.image.tag` | string | Container image tag. | `0.1` | No |
+| `container.restart_count` | int | Number of times the container was restarted by container orchestrator. | `0`; `2` | No |
 <!-- endsemconv -->