diff --git a/installers/install_ngsa.sh b/installers/install_ngsa.sh
index 5d7ad68..b90c3dc 100755
--- a/installers/install_ngsa.sh
+++ b/installers/install_ngsa.sh
@@ -18,6 +18,7 @@
 # Helm chart 1.6.0 correspondes to Airflow 2.3.0
 AIRFLOW_HELM_VERSION=1.6.0
 PROMPUSHGW_HELM_VERSION=1.18.2
+ALERTMANAGER_HELM_VERSION=0.22.0
 
 # Install Airflow helm chart
 function install_airflow() {
@@ -58,6 +59,22 @@
     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
 }
 
+# Install Prometheus AlertManager helm chart
+function install_prometheus_alertmanager() {
+    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
+    if ! helm -n osm status alertmanager 2> /dev/null ; then
+        # if it does not exist, install
+        helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
+        helm repo update
+        helm -n osm install alertmanager prometheus-community/alertmanager -f ${OSM_HELM_WORK_DIR}/alertmanager-values.yaml --version ${ALERTMANAGER_HELM_VERSION}
+    else
+        # if it exists, upgrade
+        helm repo update
+        helm -n osm upgrade alertmanager prometheus-community/alertmanager -f ${OSM_HELM_WORK_DIR}/alertmanager-values.yaml --version ${ALERTMANAGER_HELM_VERSION}
+    fi
+    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
+}
+
 # main
 
 OSM_DEVOPS="/usr/share/osm-devops"
@@ -106,4 +123,6 @@
 track deploy_osm airflow_ok
 install_prometheus_pushgateway
 track deploy_osm pushgateway_ok
+install_prometheus_alertmanager
+track deploy_osm alertmanager_ok