Add enhanced alerting details to host monitoring docs (#3879)

* Add enhanced alerting details to host monitoring docs

* Clarify config required to show alerts on Hosts page

* Change the note to an informational box

* Fix sentence

(cherry picked from commit 625d303)

docs/en/observability/monitor-infra/analyze-hosts.asciidoc

@@ -35,9 +35,9 @@ averages of key metrics, including CPU usage, memory usage, and throughput.
 default is 50, which means the page shows data for the top 50 hosts based on the
 most recent timestamps. You can increase the host limit to see data for more
 hosts, but doing so may impact query performance.
-* The Hosts table shows a breakdown of metrics for each host. You may need to
-page through the list or change the number of rows displayed on each page to see
-all of your hosts.
+* The Hosts table shows a breakdown of metrics for each host along with an alert count
+for any hosts with active alerts. You may need to page through the list
+or change the number of rows displayed on each page to see all of your hosts.
 * Each host name is an active link to a <<view-host-details, host details>> page,
 which includes metrics, host metadata, alerts, processes, logs, and anomalies.
 You can optionally open the host details in an overlay.
@@ -46,6 +46,8 @@ the already returned data set.
 * The tabs at the bottom of the page show an overview of the metrics, logs,
 and alerts for all hosts returned by your search.
 
+TIP: For more information about creating and viewing alerts, refer to <<create-alerts>>.
+
 [discrete]
 [[analyze-hosts-filter-view]]
 == Filter the Hosts view
@@ -170,6 +172,18 @@ image::images/hosts-view-alerts.png[Screenshot showing Alerts view]
 
 To see alerts for a specific host, refer to <<view-host-details>>.
 
+*****
+**Why are alerts missing from the Hosts page?**
+
+If your rules are triggering alerts that don't appear on the **Hosts** page,
+edit the rules and make sure they are correctly configured to associate the host name with the alert:
+
+* For Metric threshold or Custom threshold rules, select `host.name` in the **Group alerts by** field.
+* For Inventory rules, select **Host** for the node type under **Conditions**.
+
+To learn more about creating and managing rules, refer to <<create-alerts>>.
+*****
+
 [discrete]
 [[view-host-details]]
 == View host details

docs/en/observability/monitor-infra/host-details-partial.asciidoc

@@ -13,6 +13,8 @@ Change the time range to view metrics over a specific period of time.
 
 Hover over a specific time period on a chart to compare the various metrics at that given time.
 
+Expand the **Alerts** section to see alerts related to the selected host.
+
 ====
 
 [%collapsible]