healthMetricsConfig  
  Controls how cache health metrics will be emitted to CloudWatch. Cache health metrics include:
- NetworkBandwidthOutAllowanceExceeded: The network packets dropped because the throughput exceeded the aggregated bandwidth limit. This is useful for diagnosing bottlenecks in a cache configuration. 
- EngineCPUUtilization: The CPU utilization (percentage) allocated to the Redis process. This is useful for diagnosing bottlenecks in a cache configuration. 
Metrics will be recorded by API ID. You can set the value to ENABLED or DISABLED.