OBSDOCS-1796: Improve troubleshooting monitoring issues: create new section about the AlertmanagerReceiversNotConfigured alert

Author: eromanova97

Diff for: modules/monitoring-resolving-the-alertmanagerreceiversnotconfigured-alert.adoc

@@ -0,0 +1,13 @@
+// Module included in the following assemblies:
+//
+// * monitoring/troubleshooting-monitoring-issues.adoc
+
+:_mod-docs-content-type: REFERENCE
+[id="resolving-the-alertmanagerreceiversnotconfigured-alert_{context}"]
+= Resolving the AlertmanagerReceiversNotConfigured alert
+
+Every cluster that is deployed has the `AlertmanagerReceiversNotConfigured` alert firing by default. To resolve the issue, you must configure alert receivers.
+
+* For default platform monitoring, follow the steps in "Configuring alert notifications" in _Configuring core platform monitoring_.
+
+* For user workload monitoring, follow the steps in "Configuring alert notifications" in _Configuring user workload monitoring_.

Diff for: observability/monitoring/troubleshooting-monitoring-issues.adoc

@@ -28,4 +28,12 @@ include::modules/monitoring-determining-why-prometheus-is-consuming-disk-space.a
 * xref:../../support/getting-support.adoc#support-submitting-a-case_getting-support[Submitting a support case]
 
 // Resolving the KubePersistentVolumeFillingUp alert firing for Prometheus
-include::modules/monitoring-resolving-the-kubepersistentvolumefillingup-alert-firing-for-prometheus.adoc[leveloffset=+1]
+include::modules/monitoring-resolving-the-kubepersistentvolumefillingup-alert-firing-for-prometheus.adoc[leveloffset=+1]
+
+ifndef::openshift-dedicated,openshift-rosa[]
+// Resolving the AlertmanagerReceiversNotConfigured alert firing for Prometheus
+include::modules/monitoring-resolving-the-alertmanagerreceiversnotconfigured-alert.adoc[leveloffset=+1]
+[role="_additional-resources"]
+.Additional resources
+* xref:../../observability/monitoring/managing-alerts.adoc#configuring-alertmanager-to-send-notifications[Configuring Alertmanager to send notifications]
+endif::openshift-dedicated,openshift-rosa[]