Add a specific reference to AWS IAM Unique Identifiers (#8209)
Add a specific reference to AWS IAM Unique Identifiers (#8209)

* Add specification about AWS IAM Unique Identifiers

We experienced an issue where IAM roles resources were re-provisioned with the same ARNs and no change had been made to our vault role configuration but users lost access with `-method=aws`. It wasn't immediately clear to us how IAM Unique Identifiers where being used to avoid the same situations outlined in the AWS documentation. We eventually concluded that re-provisioning the roles in our auth/aws/auth would fetch the new IAM Unique Identifiers. 

I hope that this small amendment helps people avoid this problem in the future.


hartsock/vault,hashicorp/vault,hashicorp/vault,hashicorp/vault,kingland/vault,quixoten/vault,quixoten/vault,hashicorp/vault,kingland/vault,quixoten/vault,hartsock/vault,rnaveiras/vault,hartsock/vault,hartsock/vault,kingland/vault,hashicorp/vault,kingland/vault,rnaveiras/vault,quixoten/vault,rnaveiras/vault,kingland/vault,rnaveiras/vault,hashicorp/vault,hartsock/vault,rnaveiras/vault