Modify cluster

Example response

{
  "node_groups": [
    {
      "node_updates": {
        "schedule_time": "06:00"
      }
    }
  ],
  "authentication": [
    {
      "issuer_url": "https://accounts.myoidcprovider.com",
      "discovery_url": "https://accounts.myoidcprovider.com/.well-known/openid-configuration",
      "audiences": [
        "client-id-123"
      ],
      "claim_mappings": {
        "username": {
          "claim": "email",
          "prefix": "oidc:",
          "expression": "claims.email"
        },
        "groups": {
          "claim": "email",
          "prefix": "oidc:",
          "expression": "claims.email"
        },
        "uid": {
          "claim": "sub",
          "expression": "claims.sub"
        },
        "extra": [
          {
            "key": "example.org/foo",
            "value_expression": "claims.some_claim"
          }
        ]
      },
      "claim_validation_rules": [
        {
          "claim": "hd",
          "required_value": "upcloud.com",
          "expression": "claims.hd == 'upcloud.com'",
          "message": "User must belong to the upcloud.com organization domain."
        }
      ],
      "user_validation_rules": [
        {
          "expression": "!user.username.startsWith('system:')",
          "message": "Username must not start with the system: prefix."
        }
      ]
    }
  ]
}