Add uptime metrics for container, k8s Pod and k8s Node (#1617)

Signed-off-by: ChrsMark <chrismarkou92@gmail.com>
Co-authored-by: Liudmila Molkova <limolkova@microsoft.com>

.chloggen/add_k8s_uptime_metrics.yaml

@@ -0,0 +1,22 @@
+# Use this changelog template to create an entry for release notes.
+#
+# If your change doesn't affect end users you should instead start
+# your pull request title with [chore] or use the "Skip Changelog" label.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the area of concern in the attributes-registry, (e.g. http, cloud, db)
+component: k8s
+
+# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add uptime metrics for container, K8s Pod and K8s Node
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+# The values here must be integers.
+issues: [1486]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:

docs/system/container-metrics.md

@@ -12,6 +12,29 @@ This document describes instruments and attributes for common container level
 metrics in OpenTelemetry. These metrics are collected from technology-specific,
 well-defined APIs (e.g. Kubelet's API or container runtimes).
 
+### Metric: `container.uptime`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.container.uptime -->
+<!-- NOTE: THIS TEXT IS AUTOGENERATED. DO NOT EDIT BY HAND. -->
+<!-- see templates/registry/markdown/snippet.md.j2 -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-capture -->
+<!-- markdownlint-disable -->
+
+| Name     | Instrument Type | Unit (UCUM) | Description    | Stability |
+| -------- | --------------- | ----------- | -------------- | --------- |
+| `container.uptime` | Gauge | `s` | The time the container has been running [1] | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
+
+**[1]:** Instrumentations SHOULD use a gauge with type `double` and measure uptime in seconds as a floating point number with the highest precision available.
+The actual accuracy would depend on the instrumentation and operating system.
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
 ### Metric: `container.cpu.time`
 
 This metric is [opt-in][MetricOptIn].
@@ -198,3 +221,4 @@ This metric is [opt-in][MetricOptIn].
 
 [DocumentStatus]: https://opentelemetry.io/docs/specs/otel/document-status
 [MetricOptIn]: /docs/general/metric-requirement-level.md#opt-in
+[MetricRecommended]: /docs/general/metric-requirement-level.md#recommended

docs/system/k8s-metrics.md

@@ -15,6 +15,29 @@ well-defined APIs (e.g. Kubelet's API).
 Metrics in `k8s.` instruments SHOULD be attached to a [K8s Resource](/docs/resource/k8s.md)
 and therefore inherit its attributes, like `k8s.pod.name` and `k8s.pod.uid`.
 
+### Metric: `k8s.pod.uptime`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.pod.uptime -->
+<!-- NOTE: THIS TEXT IS AUTOGENERATED. DO NOT EDIT BY HAND. -->
+<!-- see templates/registry/markdown/snippet.md.j2 -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-capture -->
+<!-- markdownlint-disable -->
+
+| Name     | Instrument Type | Unit (UCUM) | Description    | Stability |
+| -------- | --------------- | ----------- | -------------- | --------- |
+| `k8s.pod.uptime` | Gauge | `s` | The time the Pod has been running [1] | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
+
+**[1]:** Instrumentations SHOULD use a gauge with type `double` and measure uptime in seconds as a floating point number with the highest precision available.
+The actual accuracy would depend on the instrumentation and operating system.
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
 ### Metric: `k8s.pod.cpu.time`
 
 This metric is [recommended][MetricRecommended].
@@ -149,6 +172,29 @@ This metric is [recommended][MetricRecommended].
 <!-- END AUTOGENERATED TEXT -->
 <!-- endsemconv -->
 
+### Metric: `k8s.node.uptime`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.node.uptime -->
+<!-- NOTE: THIS TEXT IS AUTOGENERATED. DO NOT EDIT BY HAND. -->
+<!-- see templates/registry/markdown/snippet.md.j2 -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-capture -->
+<!-- markdownlint-disable -->
+
+| Name     | Instrument Type | Unit (UCUM) | Description    | Stability |
+| -------- | --------------- | ----------- | -------------- | --------- |
+| `k8s.node.uptime` | Gauge | `s` | The time the Node has been running [1] | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
+
+**[1]:** Instrumentations SHOULD use a gauge with type `double` and measure uptime in seconds as a floating point number with the highest precision available.
+The actual accuracy would depend on the instrumentation and operating system.
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
 ### Metric: `k8s.node.cpu.time`
 
 This metric is [recommended][MetricRecommended].

model/container/metrics.yaml

@@ -1,4 +1,15 @@
 groups:
+  # container.* metrics
+  - id: metric.container.uptime
+    type: metric
+    metric_name: container.uptime
+    stability: experimental
+    brief: "The time the container has been running"
+    note: |
+      Instrumentations SHOULD use a gauge with type `double` and measure uptime in seconds as a floating point number with the highest precision available.
+      The actual accuracy would depend on the instrumentation and operating system.
+    instrument: gauge
+    unit: "s"
   # container.cpu.* metrics and attribute group
   - id: metric.container.cpu.time
     type: metric

model/k8s/metrics.yaml

@@ -1,4 +1,15 @@
 groups:
+  # k8s.pod.* metrics
+  - id: metric.k8s.pod.uptime
+    type: metric
+    metric_name: k8s.pod.uptime
+    stability: experimental
+    brief: "The time the Pod has been running"
+    note: |
+      Instrumentations SHOULD use a gauge with type `double` and measure uptime in seconds as a floating point number with the highest precision available.
+      The actual accuracy would depend on the instrumentation and operating system.
+    instrument: gauge
+    unit: "s"
   # k8s.pod.cpu.* metrics
   - id: metric.k8s.pod.cpu.time
     type: metric
@@ -52,6 +63,17 @@ groups:
       - ref: network.interface.name
       - ref: network.io.direction
 
+  # k8s.node.* metrics
+  - id: metric.k8s.node.uptime
+    type: metric
+    metric_name: k8s.node.uptime
+    stability: experimental
+    brief: "The time the Node has been running"
+    note: |
+      Instrumentations SHOULD use a gauge with type `double` and measure uptime in seconds as a floating point number with the highest precision available.
+      The actual accuracy would depend on the instrumentation and operating system.
+    instrument: gauge
+    unit: "s"
   # k8s.node.cpu.* metrics
   - id: metric.k8s.node.cpu.time
     type: metric