link to other obs guides (#3199) (#3202)

(cherry picked from commit c92c236)

Co-authored-by: Brandon Morelli <[email protected]>

Author: mergify[bot]

docs/en/observability/observability-get-started.asciidoc

@@ -35,6 +35,16 @@ Follow the steps in these guides to get started:
 * <<ingest-traces,Get started with application traces and APM>>
 * <<splunk-get-started,Get started with data from Splunk>>
 
+[discrete]
+== Additional guides
+
+Ready to dig into more features of Elastic Observability? See these guides:
+
+* <<monitor-uptime-synthetics,Get started with synthetic monitoring>>
+* <<profiling-get-started,Get started with Universal Profiling>>
+* <<create-alerts,Create an alert>>
+* <<slo-create,Create a service-level objective (SLO)>>
+
 [discrete]
 == Related content