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acend · Jan 11, 2024 · 9daacae · 9daacae
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diff --git a/content/en/docs/01/_index.md b/content/en/docs/01/_index.md
@@ -21,7 +21,7 @@ The following access must be available:
 * Lab Pages: https://microservices-lab.training.acend.ch/docs/
 * Docker Registries: [docker.io](https://docker.io) and [quay.io](https://quay.io)
 * Source Repositories: [github.com](https://github.com)
-* Various web resources: like [quarkus.io](https://www.quarkus.io/), [microprofile.io](https://www.microprofile.io/), Google Drive, ... 
+* Various web resources: like [quarkus.io](https://www.quarkus.io/), [microprofile.io](https://www.microprofile.io/), Google Drive, ...
 * Public maven repositories like maven-central.
 
 

diff --git a/content/en/docs/02/part/25.md b/content/en/docs/02/part/25.md
@@ -1,12 +1,17 @@
 ---
-title: "2.5 Metrics"
-linkTitle: "2.5 Metrics"
+title: "2.5 Metrics (optional)"
+linkTitle: "2.5 Metrics (optional)"
 weight: 250
 sectionnumber: 2.5
 description: >
   Inspecting the application metric setup.
 ---
 
+{{% whenSectionType "optional" %}}
+{{% alert title="Optional Section" color="optional" %}} {{% param "optional-text" %}} {{% /alert %}}
+{{% /whenSectionType %}}
+
+
 ## Metrics with Prometheus and Grafana
 
 The involved components for our metrics to be working are:

diff --git a/content/en/docs/02/part/26.md b/content/en/docs/02/part/26.md
@@ -1,12 +1,16 @@
 ---
-title: "2.6 Application Tracing"
-linkTitle: "2.6 Application Tracing" 
+title: "2.6 Application Tracing (optional)"
+linkTitle: "2.6 Application Tracing (optional)" 
 weight: 260
 sectionnumber: 2.6
 description: >
   Inspecting the tracing setup.
 ---
 
+{{% whenSectionType "optional" %}}
+{{% alert title="Optional Section" color="optional" %}} {{% param "optional-text" %}} {{% /alert %}}
+{{% /whenSectionType %}}
+
 
 ## OpenTracing with Jaeger Tracing
 

diff --git a/content/en/docs/03/_index.md b/content/en/docs/03/_index.md
@@ -35,7 +35,10 @@ Think of a rich article catalog with pictures, thumbnails and a detailed descrip
 
 In the first version we will use the two microservice `order` and `stock`.
 
-In a second version we will introduce the `lra-coordinator` and our environment will look like this.
+![Environment](rest.png)
+
+
+In a second version we will introduce the `lra-coordinator` to handle transactions and our environment will look like this.
 
 ![Environment](rest-lra.png)
 

diff --git a/content/en/docs/03/part/36.md b/content/en/docs/03/part/36.md
@@ -198,7 +198,7 @@ Add LRA Coordinator (do not forget to add the volume)
     ports:
       - 8090:8080
     environment:
-      - THORNTAIL_LOGGING_ROOT-LOGGER.LEVEL=DEBUG
+      - LOG_LEVEL=DEBUG
 
 # ... omitted
 

diff --git a/content/en/docs/03/rest-lra.png b/content/en/docs/03/rest-lra.png
diff --git a/diagram/microservices-drawio.xml b/diagram/microservices-drawio.xml