Redis printed this

OOM command not allowed when used memory > 'maxmemory'.

What it meansRedis has reached its maxmemory limit and the eviction policy does not allow freeing keys, so it rejects commands that add data.

The first thing to checkCheck INFO memory and maxmemory-policy; set TTLs on keys, choose an eviction policy like allkeys-lru for caches, or raise maxmemory.