Are there any default or custom templates to detect number of users on Always On VPN (RRAS)?

This one may help. It is who is connected and when they connected and disconnected. 

This an ASA type VPN

SELECT [data].[OrionNode].[DisplayName] AS [DisplayName],[data].[RemoteAccessSessions].[UserName] AS [UserName],toLocal([data].[RemoteAccessSessions].[ConnectedTime]) AS [ConnectedTime],toLocal([data].[RemoteAccessSessions].[DisconnectedTime]) AS [DisconnectedTime],[data].[RemoteAccessSessions].[InTotalBytes] AS [InTotalBytes],[data].[RemoteAccessSessions].[OutTotalBytes] AS [OutTotalBytes],[data].[RemoteAccessSessions].[RasProtocol] AS [RasProtocol],[data].[RemoteAccessSessions].[ClientInfo] AS [ClientInfo],[data].[InstanceSiteId] AS [InstanceSiteId]
FROM orion.asa.node AS data

Thank you. I ended up creating a component monitor that pulls a performance counter from the server. I will post that answer as well.

Here is the solution I came up with:

1. Create a new Application Monitor Template.

2. Add a new Component Monitor.

3. Name the monitor something meaningful, like "Total number of active Always On VPN RRAS connections"

4. Make the component type Performance Counter Monitor.

5. Enter the following info:

Counter: Total Connections

Category: RAS Total

When you create this template and assign it to a node, you'll see the following result under the Components section of the assignedapplication monitor:

You can then create a custom chart based on this component that shows the number of connections.