# FAQs on REST API Variables

## 1. How to get the Device MO Name?

**Device MO Name** is a unique identifier assigned to a device in OpManager. It is required while invoking REST APIs that fetch device-level details such as monitors, metrics, availability, and performance data.

- Open the browser developer tools and check the Network tab.
- Navigate to **Inventory → Devices.**
- Identify the `listDevices` API call triggered while loading the Devices list.
- The value returned in the `deviceName` field represents the Device MO Name.

![Device MO Name](https://www.manageengine.com/network-monitoring/help/images/device-mo-name.png)

- This MO Name is required for APIs that retrieve device-related metrics, monitors, and performance data.

**Note:** The Device MO Name can also be retrieved programmatically using the [v2/listDevices API](https://www.manageengine.com/network-monitoring/help/rest-api-opmanager.html#listDevices-v2).

## 2. How to get the vCenter MO Name?

**vCenter MO Name** is the unique identifier assigned to a monitored vCenter server. It is used in REST APIs to fetch vCenter-specific entities such as virtual machines, ESXi hosts, and datastores.

- Open the Network tab in the browser developer tools.
- Navigate to **Servers → Virtualization → VMware.**
- Select the **vCenter tab** from the left panel.
- Identify the API call that lists virtual devices.

![vCenter MO Name](https://www.manageengine.com/network-monitoring/help/images/vcentre-mo-name.png)

- The value returned in the `deviceName` field represents the vCenter MO Name.

**Note:** The vCenter MO Name can also be retrieved using the [listVirtualDevices API](https://www.manageengine.com/network-monitoring/help/rest-api-opmanager.html#listVirtualDevices).

## 3. How to get the Group MOID?

**Group MOID** is the unique identifier assigned to a logical group in OpManager. It is required for APIs that retrieve group-related devices, monitors, and availability information.

- Open the Network tab in the browser developer tools.
- Navigate to **Settings → Configuration → Groups.**
- Identify the API call used to list logical groups.

![Group MOID](https://www.manageengine.com/network-monitoring/help/images/group-moid.png)

- The value returned in the `groupID` field represents the Group MOID.

**Note:** The Group MOID can also be retrieved using the [listAllLogicalGroups API](https://www.manageengine.com/network-monitoring/help/rest-api-opmanager.html#listAllLogicalGroups).

## 4. How to get the Policy Name?

**Policy Name** is a unique identifier for performance monitors. It helps uniquely identify each monitor and is required when fetching monitor-level graphs and performance data.

- Open the Network tab in the browser developer tools.
- Navigate to **Inventory and select a monitored device.**
- Click the **Graph icon** available on the device's snapshot page.
- Identify the response from the [getGraphNames API](https://www.manageengine.com/network-monitoring/help/rest-api-opmanager.html#getGraphNames).

![Policy Name](https://www.manageengine.com/network-monitoring/help/images/policyname.png)

- The value returned in the `policyName` field represents the Policy Name.

## 5. How to get the Graph Name?

**Graph Name** is the unique identifier used to identify the performance monitor associated with the device. This parameter must be passed for instance-based monitors (C:, D:, CPU0, CPU1, etc.), such as partition or database instance monitors, along with the corresponding instance name.

- Open the Network tab in the browser developer tools.
- Navigate to **Inventory → Devices,** and select a monitored device.
- Click the **Graph icon** available on the device snapshot page.
- Identify the API call triggered for fetching graph details.

![Graph Name](https://www.manageengine.com/network-monitoring/help/images/graph-name.png)

- The value returned in the `name` field represents the Graph Name.
- The Graph Name can also be retrieved using the [getGraphNames API](https://www.manageengine.com/network-monitoring/help/rest-api-opmanager.html#getGraphNames).

## 6. How to get the Poll ID of a monitor?

**Poll ID** is a unique identifier for performance monitors associated with devices. It is required when fetching monitor-level graphs and performance data.

- Open the Network tab in the browser developer tools.
- Navigate to **Inventory → Devices** and select a monitored device.
- Click the Graph icon on the device snapshot page.
- Identify the response from the [getGraphNames API](https://www.manageengine.com/network-monitoring/help/rest-api-opmanager.html#getGraphNames).

![Poll ID](https://www.manageengine.com/network-monitoring/help/images/poll-id.png)

- The value returned in the `pollId` field represents the Poll ID of the monitor.

## 7. How to get the instance name of an MSSQL monitor?

**MSSQL Instance Name** identifies the SQL Server instance being monitored (for example, DEFAULT or SQLEXPRESS). It is required when invoking MSSQL-specific monitoring APIs.

- Open the Network tab in the browser developer tools.
- Navigate to **Inventory → Devices** and select a monitored device.
- Open the MSSQL tab on the device snapshot page.
- Identify the API call used to retrieve MSSQL instance information.

![MSSQL Instance Name](https://www.manageengine.com/network-monitoring/help/images/instance-mssql.png)

- The response lists available and selected SQL instances.