if used_memory >= crit_memory
      critical "Redis running on #{config[:host]}:#{config[:port]} is above the CRITICAL limit: #{used_memory}KB used / #{crit_memory}KB limit"
    elsif used_memory >= warn_memory
      warning "Redis running on #{config[:host]}:#{config[:port]} is above the WARNING limit: #{used_memory}KB used / #{warn_memory}KB limit"
    else