= According to the CyberArk Sentry Secrets Manager documentation, the replace method is used to overwrite an existing policy branch with a new policy file. This method is suitable for making changes to the existing resources, such as modifying their annotations, permissions, or attributes. The replace method preserves the existing data and secrets associated with the resources, but removes any resources that are not defined in the new policy file. Therefore, to change the annotations for authentication of a Conjur host, the replace method is the best option.

The append method is used to add new resources or data to an existing policy branch, without affecting the existing resources. This method is suitable for creating new hosts, groups, variables, or secrets, but not for modifying the existing ones. The append method will ignore any changes to the existing resources, such as annotations, and will only load the new resources or data.

The delete method is used to remove resources or data from an existing policy branch, without affecting the other resources. This method is suitable for deleting hosts, groups, variables, or secrets, but not for modifying them. The delete method will remove any resources or data that are defined in the policy file, and will ignore any resources or data that are not defined in the policy file.

The update method is used to modify the data or secrets associated with existing resources, without affecting the resources themselves. This method is suitable for changing the values of variables or secrets, but not for changing the annotations, permissions, or attributes of the resources. The update method will only load the data or secrets that are defined in the policy file, and will ignore any resources or data that are not defined in the policy file. References: = Annotation reference | CyberArk Docs; Policy load modes | CyberArk Docs; Policy - docs.cyberark.com