docs: Document criteria for freezing a publication #353

docs/admin/siteadmin.rst

@@ -292,6 +292,11 @@ And, re-publish the messages, using the Django `shell <https://docs.djangoprojec
 Unpublish or freeze a publication
 ---------------------------------
 
+A publication is frozen if:
+
+-  The spider is `removed from Kingfisher Collect <https://kingfisher-collect.readthedocs.io/en/latest/history.html>`__. The publication is never unfrozen.
+-  The source is temporarily broken or otherwise unavailable. The publication is unfrozen when the source is fixed.
+
 #. `Find the publication <https://data.open-contracting.org/admin/data_registry/collection/>`__
 #. Uncheck *Public*, to hide the publication
 #. Check *Frozen*, to stop jobs from being scheduled