diff --git a/04-monitoring.html b/04-monitoring.html
index 5d74257..d4b90be 100644
--- a/04-monitoring.html
+++ b/04-monitoring.html
@@ -208,6 +208,18 @@ <h2>System monitoring</h2>
 <p>System monitoring does not show whether your application is available
 to users!</p>
 </section>
+<section id="system-monitoring-tools" class="slide level2">
+<h2>System monitoring tools</h2>
+<figure>
+<img data-src="assets/linux_observability_tools.png"
+alt="Linux Performance Observability Tools Overview" />
+<figcaption aria-hidden="true">Linux Performance Observability Tools
+Overview</figcaption>
+</figure>
+<p>Source: Gregg, B. (2021) <em>Linux Performance.</em> <a
+href="https://www.brendangregg.com/linuxperf.html"
+class="uri">https://www.brendangregg.com/linuxperf.html</a></p>
+</section>
 <section id="network-monitoring" class="slide level2">
 <h2>Network monitoring</h2>
 <ul>
diff --git a/README.md b/README.md
index 1362e34..44ddf15 100644
--- a/README.md
+++ b/README.md
@@ -12,4 +12,4 @@ Course topics:
 - 3 - [Container Orchestration with Kubernetes](03-kubernetes.html)
 - 4 - [Monitoring with Prometheus](04-monitoring.html)
 
-Published: 2024-10-09T08:12:32+00:00
+Published: 2024-10-23T07:11:40+00:00
diff --git a/assets/linux_observability_tools.png b/assets/linux_observability_tools.png
new file mode 100644
index 0000000..678e61f
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