XTRIM

XTRIM key MAXLEN [=|~] length 

#Example

redis> XADD mystream \* field1 A field2 B field3 C field4 D "1609040575750-0" redis> XTRIM mystream MAXLEN 2 (integer) 0 redis> XRANGE mystream - + 1) 1) "1609040575750-0" 2) 1) "field1" 2) "A" 3) "field2" 4) "B" 5) "field3" 6) "C" 7) "field4" 8) "D" 

Trims the stream to (approximately if '~' is passed) a certain size