Cerberus is designed for storing application secrets such as passwords, API keys, and certificates. It is not meant to be a general purpose Key/Value store for storing any kind of data. It is not a replacement for applications like Cassandra, DynamoDB, or Reddis.
When writing data to Cerberus the request body size should be less than 256 KB.
Cerberus lazily creates a KMS key for every unique configured IAM role the first time they authenticate. By default Amazon limits the number of KMS keys per region per account to 1000.