`contact_type_not_creatable`

422 Unprocessable Content Contacts of this type can no longer be created.

When you get it

Contacts of this type can no longer be created. It is always answered with HTTP 422 - one code means one status, so a client may key its handling on either.

Fields it carries

Inside each errors[] entry, beside pointer:

type: The monitor or contact type the rule applies to.
successor: What to use instead of the discontinued value.
allowed: The complete set of values this field accepts. Send one of these.

A field is omitted when the server genuinely does not know it - an absent member is never the same as an empty one.

How to fix it

The request was well-formed but a value is not acceptable. The fields above name the offending value and what would be accepted - fix the request and retry.

Shape

{
  "type":   "https://api2.host-tracker.com/problems/contact-type-not-creatable",
  "title":  "Contacts of this type can no longer be created.",
  "status": 422,
  "code":   "contact_type_not_creatable",
  "errors": [
    { "type": …, "successor": …, "allowed": … }
  ]
}