_KTHREAD_TAG

Windows 11 Insider Preview (Jun 2021)
Windows 11 21H2 (Original Release, Cobalt)
Windows 11 22H2 (2022 Update, Nickel R1)
//0x4 bytes (sizeof)
enum _KTHREAD_TAG
{
    KThreadTagNone = 0,
    KThreadTagMediaBuffering = 1,
    KThreadTagDeadline = 2,
    KThreadTagMediaOther = 3,
    KThreadTagMax = 4
};