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Encontrei um exemplo nos meus arquivos. Não sei exatamente quem me passou ou se encontrei no documento de performance, mas vou deixar registrado no blog. Frequentemente utilizo o script para lembrar da sintaxe do XQuery e da conversão de timestamp.

SELECT CONVERT (varchar(30), GETDATE(), 121) as runtime,
DATEADD (ms, -1 * (sys.ms_ticks - a.[Record Time]), GETDATE()) AS Notification_time,
a.* , sys.ms_ticks AS [Current Time]
FROM
(SELECT x.value('(//Record/ResourceMonitor/Notification)[1]', 'varchar(30)') AS [Notification_type],
x.value('(//Record/MemoryRecord/MemoryUtilization)[1]', 'bigint') AS [MemoryUtilization %],
x.value('(//Record/MemoryRecord/TotalPhysicalMemory)[1]', 'bigint') AS [TotalPhysicalMemory_KB],
x.value('(//Record/MemoryRecord/AvailablePhysicalMemory)[1]', 'bigint') AS [AvailablePhysicalMemory_KB],
x.value('(//Record/MemoryRecord/TotalPageFile)[1]', 'bigint') AS [TotalPageFile_KB],
x.value('(//Record/MemoryRecord/AvailablePageFile)[1]', 'bigint') AS [AvailablePageFile_KB],
x.value('(//Record/MemoryRecord/TotalVirtualAddressSpace)[1]', 'bigint') AS [TotalVirtualAddressSpace_KB],
x.value('(//Record/MemoryRecord/AvailableVirtualAddressSpace)[1]', 'bigint') AS [AvailableVirtualAddressSpace_KB],
x.value('(//Record/MemoryNode/@id)[1]', 'bigint') AS [Node Id],
x.value('(//Record/MemoryNode/ReservedMemory)[1]', 'bigint') AS [SQL_ReservedMemory_KB],
x.value('(//Record/MemoryNode/CommittedMemory)[1]', 'bigint') AS [SQL_CommittedMemory_KB],
x.value('(//Record/@id)[1]', 'bigint') AS [Record Id],
x.value('(//Record/@type)[1]', 'varchar(30)') AS [Type],
x.value('(//Record/ResourceMonitor/Indicators)[1]', 'bigint') AS [Indicators],
x.value('(//Record/@time)[1]', 'bigint') AS [Record Time]
FROM (SELECT CAST (record as xml) FROM sys.dm_os_ring_buffers
WHERE ring_buffer_type = 'RING_BUFFER_RESOURCE_MONITOR') AS R(x)) a
CROSS JOIN sys.dm_os_sys_info sys
ORDER BY a.[Record Time] ASC

Tenho mais um script utilizando XEvent gravando os registros no Ring Buffers. Vou procurar e postar em seguida.