You cannot assign a delegated administrator to an individual Identity Server. You can only assign a delegated administrator to a cluster configuration, which gives the delegated administrator rights to all the cluster members.
When a delegated administrator of an Identity Server cluster is granted the View/Modify rights, the administrator has sufficient rights to change the cluster configuration and to stop, start, and update Identity Servers in that cluster. The administrator is granted view rights to the keystores for each Identity Server in the cluster. To change any of the certificates, the administrator needs to be the admin user rather than a delegated administrator.
The delegated administrator of an Identity Server cluster is granted View Only rights to the master policy container. If you want the delegated administrator with View/Modify rights to have sufficient rights to manage policies, grant the following rights:
To have sufficient rights to create Role policies, grant View/Modify rights to a policy container.
To have sufficient rights to enable Role policies, grant View Only rights to the policy containers with Role policies.