1. visit http://jenkins/credentials/store/system/domain/_/
2. click the wrench for a SSH Username with private key item

Actual results:

• Scope
• ID
• Description 
• Username
• Private Key
  • Enter directly
  • Key Concealed for Confidentiality [Replace]
• Passphrase

Expected results:

Private Key should be Key, and under Enter directly, there should be a Public Key showing the current calculated Public Key. The item currently labeled as Key should be renamed Private Key.

See also JENKINS-56940