Add note about atop

notebook/Linux/Tools/atop.md

@@ -0,0 +1,27 @@
+# Advanced System & Process Monitor
+
+```sh
+atop 1
+```
+Monitor system resources with a 1 second interval.
+
+```sh
+atop -w /path/to/log/file 60
+```
+Record performance stats to a given file once per minute.
+> [!WARNING]
+> Keep intervals reasonably long to prevent report files from growing too large over time.
+
+```sh
+atop -r /path/to/file
+```
+Open a previously recorded log to evaluate its contents.
+
+```sh
+atopsar -A -b 8:00 -e 12:00
+```
+Print performance reports for a given time span.
+
+>[!HINT]
+>Use the `z` key to pause atop and evaluate the current snapshot of system resoures.
+>The update interval can be changed with the `i` key.