Add k8s.container.restart_count Resource attribute

This change adds a Resource attribute to represent number of container restarts in kubernetes. 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

@@ -85,6 +85,8 @@ release.
   ([#1890](https://github.com/open-telemetry/opentelemetry-specification/pull/1890))
 - Add HTTP request and response headers semantic conventions.
   ([#1898](https://github.com/open-telemetry/opentelemetry-specification/pull/1898))
+- Add `k8s.container.restart_count` Resource attribute.
+  ([#1945](https://github.com/open-telemetry/opentelemetry-specification/pull/1945))
 
 ### Compatibility
 

semantic_conventions/resource/k8s.yaml

@@ -63,6 +63,13 @@ groups:
         brief: >
           The name of the Container in a Pod template.
         examples: ['redis']
+      - id: restart_count
+        type: int
+        brief: >
+          Number of times the container was restarted. This attribute can be
+          used to identify a particular container (running or stopped) within a
+          container spec.
+        examples: [0, 2]
 
   - id: k8s.replicaset
     prefix: k8s.replicaset

specification/resource/semantic_conventions/k8s.md

@@ -88,6 +88,7 @@ to a running container.
 | Attribute  | Type | Description  | Examples  | Required |
 |---|---|---|---|---|
 | `k8s.container.name` | string | The name of the Container in a Pod template. | `redis` | No |
+| `k8s.container.restart_count` | int | Number of times the container was restarted. This attribute can be used to identify a particular container (running or stopped) within a container spec. | `0`; `2` | No |
 <!-- endsemconv -->
 
 ## ReplicaSet