Added steps to install node exporter, added trouble shooting guide for common Prometheus errors

Author: DhruvSehgal

articles/virtual-machines/workloads/sap/configure-linux-os-azure-monitor-sap-solutions.md

@@ -13,15 +13,24 @@ ms.author: sujaj
 
 [!INCLUDE [Azure Monitor for SAP solutions public preview notice](./includes/preview-azure-monitor.md)]
 
-In this how-to guide, you'll learn to create a Linux OS provider for *Azure Monitor for SAP solutions* resources. 
+In this how-to guide, you'll learn to create a Linux OS provider for *Azure Monitor for SAP solutions* resources.
 
 This content applies to both versions of the service, *Azure Monitor for SAP solutions* and *Azure Monitor for SAP solutions (classic)*.
 
 ## Prerequisites
 
-- An Azure subscription. 
+- An Azure subscription.
 - An existing Azure Monitor for SAP solutions resource. To create an Azure Monitor for SAP solutions resource, see the [quickstart for the Azure portal](azure-monitor-sap-quickstart.md) or the [quickstart for PowerShell](azure-monitor-sap-quickstart-powershell.md).
-- Install [node exporter version 1.3.0](https://prometheus.io/download/#node_exporter) in each SAP host that you want to monitor, either BareMetal or Azure virtual machine (Azure VM). For more information, see [the node exporter GitHub repository](https://github.com/prometheus/node_exporter).    
+- Install [node exporter version 1.3.0](https://prometheus.io/download/#node_exporter) in each SAP host that you want to monitor, either BareMetal or Azure virtual machine (Azure VM). For more information, see [the node exporter GitHub repository](https://github.com/prometheus/node_exporter).
+
+### Steps to install node exporter:
+You can follow the step by step [guide to install node exporter on linux system](https://prometheus.io/docs/guides/node-exporter/):
+- wget https://github.com/prometheus/node_exporter/releases/download/v*/node_exporter-*.*-amd64.tar.gz
+- tar xvfz node_exporter-*.*-amd64.tar.gz
+- cd node_exporter-*.*-amd64
+- ./node_exporter
+- The node exporter now will start collecting data, and can be exported at the following address:
+    - `http://IP:9100/metrics`
 
 ## Create Linux provider
 
@@ -31,18 +40,30 @@ This content applies to both versions of the service, *Azure Monitor for SAP sol
 1. Select **Add provider**.
 1. Configure the following settings for the new provider:
     1. For **Type**, select **OS (Linux)**.
-    1. For **Name**, enter a name that will be the identifier for the BareMetal instance.         
-    1. For **Node Exporter Endpoint**, enter `http://IP:9100/metrics`.    
+    1. For **Name**, enter a name that will be the identifier for the BareMetal instance.
+    1. For **Node Exporter Endpoint**, enter `http://IP:9100/metrics`.
     1. For the IP address, use the private IP address of the Linux host. Make sure the host and Azure Monitor for SAP solutions resource are in the same virtual network.
-1. Open firewall port 9100 on the Linux host. 
-     1. If you're using `firewall-cmd`, run `_firewall-cmd_ _--permanent_ _--add-port=9100/tcp_ ` then `_firewall-cmd_ _--reload_`.
-     1. If you're using `ufw`, run `_ufw_ _allow_ _9100/tcp_` then `_ufw_ _reload_`.
-1. If the Linux host is an Azure virtual machine (VM), make sure that all applicable network security groups (NSGs) allow inbound traffic at port 9100 from **VirtualNetwork** as the source.         
-1. Select **Add provider** to save your changes. 
+1. Open firewall port 9100 on the Linux host.
+    1. If you're using `firewall-cmd`, run `_firewall-cmd_ _--permanent_ _--add-port=9100/tcp_ ` then `_firewall-cmd_ _--reload_`.
+    1. If you're using `ufw`, run `_ufw_ _allow_ _9100/tcp_` then `_ufw_ _reload_`.
+1. If the Linux host is an Azure virtual machine (VM), make sure that all applicable network security groups (NSGs) allow inbound traffic at port 9100 from **VirtualNetwork** as the source.
+1. Select **Add provider** to save your changes.
 1. Continue to add more providers as needed.
 1. Select **Review + create** to review the settings.
 1. Select **Create** to finish creating the resource.
 
+## Trouble shooting guide for common exceptions
+
+### Unable to reach the prometheus endpoint
+The provider settings validation operation has failed with code ‘PrometheusURLConnectionFailure’.
+
+1. Open firewall port 9100 on the Linux host.
+    1. If you're using `firewall-cmd`, run `_firewall-cmd_ _--permanent_ _--add-port=9100/tcp_ ` then `_firewall-cmd_ _--reload_`.
+    1. If you're using `ufw`, run `_ufw_ _allow_ _9100/tcp_` then `_ufw_ _reload_`.
+1. Try to restart the node exporter agent:
+    1. cd to the folder where you installed the node exporter. (node_exporter-*.*-amd64)
+    1. ./node_exporter
+
 ## Next steps
 
 > [!div class="nextstepaction"]