RtlGetUnloadEventTraceEx - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTRTL_H
// begin_msdn:"Winternl"
#if (PHNT_VERSION >= PHNT_VISTA)

NTSYSAPI
VOID
NTAPI
RtlGetUnloadEventTraceEx(
    _Out_ PULONG *ElementSize,
    _Out_ PULONG *ElementCount,
    _Out_ PVOID *EventTrace // works across all processes
    );

#endif
// end_msdn
#endif

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This function is documented in Windows SDK.