add link to learning center course on troubleshooting apm (#33052)

Author: domalessi

content/en/tracing/trace_collection/automatic_instrumentation/single-step-apm/_index.md

@@ -15,6 +15,9 @@ further_reading:
   - link: /tracing/trace_collection/automatic_instrumentation/single-step-apm/troubleshooting/
     tag: Documentation
     text: "Troubleshooting Single Step APM"
+  - link: https://learn.datadoghq.com/courses/troubleshooting-apm-instrumentation-on-a-host
+    tag: Learning Center
+    text: Troubleshooting APM Instrumentation on a Host
   - link: /tracing/guide/local_sdk_injection
     tag: Documentation
     text: Instrument your applications using local SDK injection

content/en/tracing/trace_collection/automatic_instrumentation/single-step-apm/troubleshooting.md

@@ -2,8 +2,11 @@
 title: Troubleshooting Single Step APM
 further_reading:
 - link: /tracing/trace_collection/automatic_instrumentation/single-step-apm/
-  tag: "Documentation"
-  text: "Single Step APM Instrumentation"
+  tag: Documentation
+  text: Single Step APM Instrumentation
+- link: https://learn.datadoghq.com/courses/troubleshooting-apm-instrumentation-on-a-host
+  tag: Learning Center
+  text: Troubleshooting APM Instrumentation on a Host
 ---
 
 ## Overview

content/en/tracing/troubleshooting/_index.md

@@ -34,6 +34,9 @@ further_reading:
 - link: '/tracing/services/inferred_services'
   tag: 'Documentation'
   text: 'Inferred Service dependencies'
+- link: https://learn.datadoghq.com/courses/troubleshooting-apm-instrumentation-on-a-host
+  tag: Learning Center
+  text: Troubleshooting APM Instrumentation on a Host
 ---
 
 If you experience unexpected behavior while using Datadog APM, read the information on this page to help resolve the issue. Datadog recommends regularly updating to the latest version of the Datadog tracing libraries you use, as each release contains improvements and fixes. If you continue to experience issues, reach out to [Datadog support][1].