The #OpenStreetMap planet replication diffs are not currently updating. We are trying to get the issue resolved as soon as possible. #OSM
It is expected OpenStreetMap.org will be offline briefly for maintenance later. We have to stop some systems briefly to get the OpenStreetMap planet diffs (minutely / hourly / daily) back into sync with the database. The maintenance window will be announced as soon as possible.
Progress on restoring the OSM planet diff publishing is being made, but care is being taken to ensure that only the expected data is published and we don't miss things.
OSM planet replication diffs are now being published again.
@osm_tech What are replication diffs?
@sinabhfuil Data we publish minutely, hourly and daily for others to synchronise with current #OpenStreetMap edits. Many services use it: eg: the rendered maps on OpenStreetMap.org, nominatim, etc. We also publish a weekly export which is not affected by the issue.

@osm_tech Thanks for the update, and good luck with the fix.

(I'll stop hitting F5 after double-checking that my changeset uploaded !)