docs:tutorial: add debugging tetragon with log levels

Signed-off-by: Djalal Harouni <tixxdz@gmail.com>

docs/content/en/docs/tutorials/debugging-tetragon.md

@@ -0,0 +1,37 @@
+---
+title: "Debugging Tetragon"
+weight: 1
+icon: "overview"
+description: "Diagnosing Tetragon problems"
+---
+
+### Enable debug log level
+
+When debugging, it might be useful to change the log level. The default log level is controlled by the log-level option:
+
+* Enable debug level with `--log-level=debug`
+
+* Enable trace level with `--log-level=trace`
+
+### Change log level dynamically
+
+It is possible to change the log level dynamically by sending the corresponding signal to tetragon process.
+
+* Change log level to debug level by sending the `SIGRTMIN+20` signal to tetragon pid:
+
+  ```shell
+  sudo kill -s SIGRTMIN+20 $(pidof tetragon)
+  ```
+
+* Change log level to trace level by sending the `SIGRTMIN+21` signal to tetragon pid:
+
+  ```shell
+  sudo kill -s SIGRTMIN+21 $(pidof tetragon)
+  ```
+
+* To Restore the original log level send the `SIGRTMIN+22` signal to tetragon pid:
+
+  ```shell
+  sudo kill -s SIGRTMIN+22 $(pidof tetragon)
+  ```
+