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unknown_event_type

422 Unprocessable Content   The webhook declares an event type outside the published catalogue.

When you get it

The webhook declares an event type outside the published catalogue. 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:

value

The value the request sent, echoed back so the caller can see what was read.

allowed

The complete set of values this field accepts. Send one of these.

didYouMean

The registered name closest to the one you sent - usually the fix is this spelling.

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/unknown-event-type",
  "title":  "The webhook declares an event type outside the published catalogue.",
  "status": 422,
  "code":   "unknown_event_type",
  "errors": [
    { "value": …, "allowed": …, "didYouMean": … }
  ]
}