add system.linux.memory.slab to system metrics

.chloggen/add_linux_memory_slab.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: system
+
+# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add `system.linux.memory.slab` metric
+
+# 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: [531]
+
+# (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/system-metrics.md

@@ -57,6 +57,7 @@ Resource attributes related to a host, SHOULD be reported under the `host.*` nam
   - [Metric: `system.process.created`](#metric-systemprocesscreated)
 - [`system.{os}.` - OS Specific System Metrics](#systemos---os-specific-system-metrics)
   - [Metric: `system.linux.memory.available`](#metric-systemlinuxmemoryavailable)
+  - [Metric: `system.linux.memory.slab`](#metric-systemlinuxmemoryslab)
 
 <!-- tocstop -->
 
@@ -1466,6 +1467,25 @@ See also `MemAvailable` in [/proc/meminfo](https://man7.org/linux/man-pages/man5
 
 
 
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
+### Metric: `system.linux.memory.slab`
+
+<!-- semconv metric.system.linux.memory.slab(metric_table) -->
+<!-- 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 |
+| -------- | --------------- | ----------- | -------------- | --------- |
+| `system.linux.memory.slab` | UpDownCounter | `By` | Memory used by the Linux kernel for managing caches of frequently used objects | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
+
+
 <!-- markdownlint-restore -->
 <!-- prettier-ignore-end -->
 <!-- END AUTOGENERATED TEXT -->

model/metrics/system-metrics.yaml

@@ -340,3 +340,13 @@ groups:
     instrument: updowncounter
     unit: "By"
     attributes: []
+
+  - id: metric.system.linux.memory.slab
+    type: metric
+    metric_name: system.linux.memory.slab
+    stability: experimental
+    brief: "Memory used by the Linux kernel for managing caches of frequently used objects"
+    instrument: updowncounter
+    unit: "By"
+    attributes:
+      - ref: system.memory.state