How to add OS monitoring to database agent (SQL Server, Oracle, DB2) (4260414)

How to add OS monitoring if the database agent has been installed already?

How to enable Operating System (OS) collections on an existing database agent?

RESOLUTION 1 Using the database agent administration panel   *This is the recommend method*

Steps to add OS monitoring to a database agent. 

1. Select (Check box) the agent in the database dashboard
2. Select the database agent checkbox
3. Select "Settings" and "Administration"
4. Choose Connection Details and click Set credentials
5. In the Set credentials box under OS Monitoring, click Edit Host Connection Details radial button and checkmark Enable OS Monitoring.
6. Choose the desired connection method and appropriate the Authentication selection. 
7. Configure the required OS credentials then click the validate button.
8. When the validate return is successful, click save to write the changes updating the Agent for OS monitoring. 

Note:  During the validation process the resource mapping is getting created. 

RESOLUTION 2 Manually creating credentials

1. Setup an infrastructure agent for the database server
2. Enable the OS monitoring for the database agent
   1. Go to "Administration | Agents | Agent Status" dashboard
   2. Select the problematic agent
   3. Click on "Edit Properties"
   4. Find "Host OS Platform" and set the parameter "Enable OS collections" to "True" and the select the correct OS from the "Platform" drop down list
3. Add the resource mapping of the OS credential for database monitoring connection
   1. Go to "Administration | Credential" dashboard
   2. Click on "Manage Credentials"
   3. Find the needed credential, click the "Edit" icon in the second column and select "Resource Mappings"
   4. Click on "Add" and select the following mapping:
      Unix: "SSH Connection for DB Monitoring"
      or Windows: "WMI Connection for DB Monitoring"
   5. "Target Host Name" if the host name will be used or "Target Host Address" if the IP will be used
   6. Select radio button "equals" and matching type "Domain Name"
   7. Now click on "Add a New Domain Name" or "Add a New IP Address" and enter the host name or IP address
   8. Click on "Add" and the newly resource mapping is create
   9. Next click Add 'AND' Condition on the newly created resource mapping
   10. Select Agent name for Access Resources Using
   11. Click on Add a New String
   12. Enter the Database Agent Name. This value is case sensitive and must match the entry under Agent Name taken from Dashboards | Administration | Agents | Agent status
   13. Click on "Save" to save the changes
   14. Finally restart the database agent.

It will take few minutes until OS data will be displayed on the database dashboards.