Now in Redis by Zabbix agent 2 template redis configuration parameter `mem_fragmentation_ratio` is used.

According to https://github.com/redis/redis/issues/9256#issuecomment-883577803 `allocator_frag_ratio` instead of `mem_fragmentation_ratio` .

Example:

```

•       - macro: '{$REDIS.MEM.ALLOCATOR_FRAG_RATIO.MAX.WARN}'
•         value: '1.5'
•         description: 'Maximum memory allocator fragmentation ratio (real frag ratio)'

•         name: 'Allocator fragmentation ratio'

•         type: DEPENDENT
•         key: redis.memory.allocator_fragmentation_ratio
•         value_type: FLOAT
•         description: 'Ratio between allocator_active and allocator_allocated. This is the true (external) fragmentation metric (not mem_fragmentation_ratio).'
•         preprocessing:
•           - type: JSONPATH
•             parameters:
•               - $.allocator_frag_ratio
•         master_item:
•           key: redis.memory.info_raw
•         tags:
•           - tag: component
•             value: memory
•         triggers:
•             expression: 'min(/Redis by Zabbix agent 2/redis.memory.allocator_fragmentation_ratio,15m)>{$REDIS.MEM.ALLOCATOR_FRAG_RATIO.MAX.WARN}'
•             name: 'Memory allocator fragmentation ratio is too high'
•             event_name: 'Memory fragmentation ratio is too high (over {$REDIS.MEM.ALLOCATOR_FRAG_RATIO.MAX.WARN} in 15m)'
•             priority: WARNING
•             description: 'Ratio between allocator_active and allocator_allocated. This is the true (external) fragmentation metric (not mem_fragmentation_ratio).'
•             tags:
•               - tag: scope
•                 value: performance
  ```