fingerprint kernel architecture name (#13182)

.changelog/13182.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+fingerprint: add support for detecting kernel architecture of clients. (attribute: `kernel.arch`)
+```

client/fingerprint/host.go

@@ -30,6 +30,7 @@ func (f *HostFingerprint) Fingerprint(req *FingerprintRequest, resp *Fingerprint
 	resp.AddAttribute("os.version", hostInfo.PlatformVersion)
 
 	resp.AddAttribute("kernel.name", runtime.GOOS)
+	resp.AddAttribute("kernel.arch", hostInfo.KernelArch)
 	resp.AddAttribute("kernel.version", hostInfo.KernelVersion)
 
 	resp.AddAttribute("unique.hostname", hostInfo.Hostname)

website/content/docs/runtime/interpolation.mdx

@@ -212,6 +212,14 @@ Below is a table documenting common node properties:
         allocated
       </td>
     </tr>
+    <tr>
+      <td>
+        <code>{'${attr.kernel.arch}'}</code>
+      </td>
+      <td>
+        Kernel architecture of the client (e.g. <code>x86_64</code>, <code>aarch64</code>)
+      </td>
+    </tr>
     <tr>
       <td>
         <code>{'${attr.kernel.name}'}</code>