EVENT_DESCRIPTOR - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTMISC_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)
#ifndef EVENT_DESCRIPTOR_DEF

typedef struct _EVENT_DESCRIPTOR
{
    USHORT Id;
    UCHAR Version;
    UCHAR Channel;
    UCHAR Level;
    UCHAR Opcode;
    USHORT Task;
    ULONGLONG Keyword;
} EVENT_DESCRIPTOR, *PEVENT_DESCRIPTOR;

#endif
#endif
#endif

View code on GitHub

This structure is documented in Windows SDK.