KVM-GetCredentials policy execution is getting failed and the "Datastore error" is occurring post the execution.
Not sure about the cause of the error and possible solution.
KVM credentials are being accessed using the variables:
private.credentials.username
Datastore error indicates issue with Cassandra component. Is your Apigee platform hosted in cloud or onprem. If hosted on cloud open a support ticket. If hosted onprem (Apigee Hybrid or Apigee opdk) check the corresponding cassandra troubleshooting docs.
Thanks