Too-long Operation outcome

In this example, operation outcome resource is having an too-long error during the validation operation.

{
    "resourceType": "OperationOutcome",
    "id": "1647c690-bcd2-4a98-b257-23632b2f7c92",
    "issue":  [
        {
            "severity": "error",
            "code": "too-long",
            "diagnostics": "<Provided content is too long for validation>"
        }
    ]
}