Returns the number of entities that are affected by each of the specified events.
See https://paws-r.github.io/docs/health/describe_entity_aggregates.html for full documentation.
health_describe_entity_aggregates(eventArns = NULL)A list of event ARNs (unique identifiers). For example:
"arn:aws:health:us-east-1::event/EC2/EC2_INSTANCE_RETIREMENT_SCHEDULED/EC2_INSTANCE_RETIREMENT_SCHEDULED_ABC123-CDE456", "arn:aws:health:us-west-1::event/EBS/AWS_EBS_LOST_VOLUME/AWS_EBS_LOST_VOLUME_CHI789_JKL101"