# Adding Custom Monitors

In addition to OpManager's default monitors, you can also create your own monitors for the SNMP-enabled devices in your network. The SNMP variable for which you intend configuring a monitor can return either a numeric or a string output when queried.

To add a custom monitor for a resource of a particular device type, the device template must be modified. The new monitor should be defined in the device template so that the monitor is associated for all devices of that type. Here are the steps.

1. Go to **Settings → Configuration → Device Templates.**
2. Click on the template in which you want to add a new monitor (for example, Linux), scroll down and click **Add** next to **Associated Monitors** column.

![Edit device templates in OpManager: Modify device template](https://www.manageengine.com/network-monitoring/help/images/add-custom-monitors.png)

3. Click the **SNMP** tab on the top of this page.
4. Configure the SNMP OID, Monitor Name, Display Name etc. and click **OK**
5. Click **Save** to save the changes to the Device Template or press **Save and Associate** to directly associate them to the devices or press **Copy** to copy the Device Template.
6. To add bulk SNMP monitors to existing templates, follow the steps provided in this page:  
   [How to add bulk custom monitors through device template?](https://www.manageengine.com/network-monitoring/how-to/add-bulk-custom-monitors-through-device-template.html)

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## Frequently asked questions:

1. [How to discover devices and interfaces in OpManager?](https://www.manageengine.com/network-monitoring/help/discover-networks.html)
2. [How to add a new credential?](https://www.manageengine.com/network-monitoring/help/add-credentials.html)
3. [Can I add a non-admin user account for WMI?](https://www.manageengine.com/network-monitoring/kb/adding-non-admin-user-for-wmi.html)
4. [Can I add devices using SSH?](https://www.manageengine.com/network-monitoring/help/adding-devices-using-ssh.html)
5. [Why are devices discovered as 'Unknown'?](https://www.manageengine.com/network-monitoring/faq/devices-discovered-as-unknown-devices-opmanager.html)
6. [What are devices supported in OpManager?](https://www.manageengine.com/network-monitoring/faq/all-devices-supported.html)
7. [Why are interfaces not discovered for my device?](https://www.manageengine.com/network-monitoring/faq/interfaces-not-discovered.html)
8. [How can I associate device templates to a newly discovered device?](https://www.manageengine.com/network-monitoring/help/associate-device-template.html)
9. [What is a discovery filter?](https://www.manageengine.com/network-monitoring/help/discovery-filter.html)
10. [How do I configure a new discovery rule?](https://www.manageengine.com/network-monitoring/help/configuring-discovery-rule-engine.html)
11. [How to manage or unmanage a device?](https://www.manageengine.com/network-monitoring/help/managing-and-unmanaging-a-device.html)
12. [How to configure device dependencies?](https://www.manageengine.com/network-monitoring/help/configuring-device-dependencies.html)
13. [How can find the missing VMs and hosts?](https://www.manageengine.com/network-monitoring/faq/find-missing-vms-and-hosts-opmanager.html)
14. [How can I discover a VLAN?](https://www.manageengine.com/network-monitoring/faq/vlan-discovery-in-opmanager.html)
15. [How does availability monitoring work in OpManager?](https://www.manageengine.com/network-monitoring/availability-monitoring.html)
16. [What are the basic system requirements to install and use OpManager?](https://www.manageengine.com/network-monitoring/help/hardware-and-software-requirements.html)
17. [How can I troubleshoot issues with device discovery?](https://www.manageengine.com/network-monitoring/help/add-device-failure-messages.html)
18. [How can I troubleshoot issues with VCenter/ESX discovery?](https://www.manageengine.com/network-monitoring/faq/troubleshooting-problems-in-vcenter-discovery.html)