Update Infrastructure Monitoring (#1381)

* Update readme.md

* Update content/roadmaps/102-devops/content/107-monitoring/100-infrastructure-monitoring/readme.md

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/102-devops/content/107-monitoring/100-infrastructure-monitoring/readme.md

@@ -1 +1,5 @@
-# Infrastructure monitoring
+# Infrastructure Monitoring
+
+Monitoring refers to the practice of making the performance and status of infrastructure visible.  This section contains common tools used for monitoring.
+
+This is a very vendor-heavy space - use caution when studying materials exclusively from a given product or project, as there are many conflicting opinions and strategies in use. There is no single solution for the most substantially complex internet-facing applications, so understanding the pros and cons of these tools will be useful in helping you plan how to monitor a system for a given goal.