We collaborate closely with DataCite on Event Data and receive events that link Crossref and DataCite metadata records. For some time, we have also been receiving events that link DataCite and DataCite records. This hasn’t usually been an issue, however, earlier this year there was a large increase in the number of events due to a DataCite member adding new relationships. This caused instability in our system and we have taken the decision to filter out events that do not involve Crossref metadata records.
DataCite operate their own Event Data platform from which Event Data users can obtain all relationships involving DataCite records, see DataCite Event Data for more details.