Add k8s.{pod,node}.memory.usage metrics (#1406)

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

.chloggen/add_k8s_memory_usage.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 k8s.pod.memory usage and k8s.node.memory.usage metrics
+
+# 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: [1406]
+
+# (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/k8s-metrics.md

@@ -60,6 +60,31 @@ This metric is [recommended][MetricRecommended].
 
 
 
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
+### Metric: `k8s.pod.memory.usage`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.pod.memory.usage -->
+<!-- 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.memory.usage` | Gauge | `By` | Memory usage of the Pod [1] | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
+
+
+**[1]:** Total memory usage of the Pod
+
+
+
 <!-- markdownlint-restore -->
 <!-- prettier-ignore-end -->
 <!-- END AUTOGENERATED TEXT -->
@@ -110,6 +135,31 @@ This metric is [recommended][MetricRecommended].
 
 
 
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
+### Metric: `k8s.node.memory.usage`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.node.memory.usage -->
+<!-- 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.memory.usage` | Gauge | `By` | Memory usage of the Node [1] | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
+
+
+**[1]:** Total memory usage of the Node
+
+
+
 <!-- markdownlint-restore -->
 <!-- prettier-ignore-end -->
 <!-- END AUTOGENERATED TEXT -->

model/k8s/metrics.yaml

@@ -19,6 +19,17 @@ groups:
     instrument: gauge
     unit: "{cpu}"
 
+  # k8s.pod.memory.* metrics
+  - id: metric.k8s.pod.memory.usage
+    type: metric
+    metric_name: k8s.pod.memory.usage
+    stability: experimental
+    brief: "Memory usage of the Pod"
+    note: >
+      Total memory usage of the Pod
+    instrument: gauge
+    unit: "By"
+
   # k8s.node.cpu.* metrics
   - id: metric.k8s.node.cpu.time
     type: metric
@@ -38,3 +49,14 @@ groups:
       CPU usage of the specific Node on all available CPU cores, averaged over the sample window
     instrument: gauge
     unit: "{cpu}"
+
+  # k8s.node.memory.* metrics
+  - id: metric.k8s.node.memory.usage
+    type: metric
+    metric_name: k8s.node.memory.usage
+    stability: experimental
+    brief: "Memory usage of the Node"
+    note: >
+      Total memory usage of the Node
+    instrument: gauge
+    unit: "By"