How to fix Less than 25% free in the configuration cache for Zabbix

  1. Remove old disabled host in configuration tab. This will free up your cache.
  2. Allow more cache in zabbix e.g change default value from 8mb to 16mb and restart zabbix servic /etc/ini.d/zabbix_server restart
 ### Option: CacheSize
   #       Size of configuration cache, in bytes.
   #       Shared memory size for storing host, item and trigger data.
   #
   # Mandatory: no
   # Range: 128K-8G
   # Default:
   # CacheSize=8M
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