Add Linux process cgroup attribute

.chloggen/add_process_cgroup.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: linux
+
+# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add linux.process.cgroup attribute
+
+# 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: [1357]
+
+# (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/attributes-registry/linux.md

@@ -6,6 +6,9 @@
 
 # Linux
 
+- [Linux Memory Attributes](#linux-memory-attributes)
+- [Linux Process Attributes](#linux-process-attributes)
+
 ## Linux Memory Attributes
 
 Describes Linux Memory attributes
@@ -20,3 +23,13 @@ Describes Linux Memory attributes
 |---|---|---|
 | `reclaimable` | reclaimable | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
 | `unreclaimable` | unreclaimable | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
+
+## Linux Process Attributes
+
+Describes Linux Process attributes
+
+| Attribute | Type | Description | Examples | Stability |
+|---|---|---|---|---|
+| <a id="linux-process-cgroup" href="#linux-process-cgroup">`linux.process.cgroup`</a> | string | The control group associated with the process. [1] | `1:name=systemd:/user.slice/user-1000.slice/session-3.scope`; `0::/user.slice/user-1000.slice/[email protected]/tmux-spawn-0267755b-4639-4a27-90ed-f19f88e53748.scope` | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
+
+**[1]:** Control groups (cgroups) are a kernel feature used to organize and manage process resources. This attribute provides the path(s) to the cgroup(s) associated with the process, which should match the contents of the [/proc/<PID>/cgroup](https://man7.org/linux/man-pages/man7/cgroups.7.html) file.

model/linux/registry.yaml

@@ -16,3 +16,20 @@ groups:
         stability: experimental
         brief: "The Linux Slab memory state"
         examples: ["reclaimable", "unreclaimable"]
+  # linux.process.* attribute group
+  - id: registry.linux.process
+    type: attribute_group
+    brief: "Describes Linux Process attributes"
+    attributes:
+      - id: linux.process.cgroup
+        type: string
+        stability: experimental
+        brief: The control group associated with the process.
+        examples: ["1:name=systemd:/user.slice/user-1000.slice/session-3.scope", "0::/user.slice/user-1000.slice/[email protected]/tmux-spawn-0267755b-4639-4a27-90ed-f19f88e53748.scope"]
+        note: >
+          Control groups (cgroups) are a kernel feature used to organize and
+          manage process resources. This attribute provides the path(s) to the
+          cgroup(s) associated with the process, which should match the contents
+          of the
+          [/proc/<PID>/cgroup](https://man7.org/linux/man-pages/man7/cgroups.7.html)
+          file.