We added the ability for EntityDB to report metrics to AWS CloudWatch. The metrics reported include the numbers of entities stored and indexed. The screen capture of an AWS CloudWatch graph is shown below. The system that generated the metrics illustrated by the chart was composed of 5 EntityDB t2.micro instances in auto-scaling group behind an elastic load balancer. An SQS queue was used for the entity queue and entities were persisted to a MongoDB database also running on a t2.micro instance. (This architecture was created using the CloudFormation templates in the GitHub repository.)
As the metrics show, the entities are being stored at a rate much faster than the entities are being indexed. We will be working to make the index rate (orange line) more closely follow the stored rate (blue line).