Redis Trigger prototype for "Memory usage is too high" is wrong:

https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/db/redis/template_db_redis.xml#1994

The correct formula would be used_memory.last()/maxmemory. However, as can be seen on link above, the formula is maxmemory/used_memory.last().

Otherwise, it will always have an value higher than 100%, as the max memory will always be higher than the used memory.

I've changed it on a template and re-uploaded and that fixed it. Note that this is inside a discovery rule. So, you must have maxmemory set on the config.

Steps to reproduce:

1. Set maxmemory value on Redis configuration
2. Trigger prototype will be create
3. Warning will show up: Problem: Redis: Memory usage is too high (over 90% in 5m)

Result:

Warning will show up: Problem: Redis: Memory usage is too high (over 90% in 5m)

Expected:
No warning. The calculation will always have an value higher than 100%, as the max memory will always be higher than the used memory. It shouldn't.