{"code":"norevision","info":"The \"revision\" parameter must be set.","docref":"See https://csb.wikipedia.org/w/api.php for API usage. Subscribe to the mediawiki-api-announce mailing list at <https://lists.wikimedia.org/mailman/listinfo/mediawiki-api-announce> for notice of API deprecations and breaking changes."}
Notably this request didn't have an oldId component and it came from OCG, not changeprop.
Parsoid can be used with arbitrary wikitext, not necessarily associated with any particular revision.
I believe OCG uses that to render the combined attributions for a book. VE does it to re-render modified extensions, and probably lots of other things.
In other words, we should account for those uses and only send to the api when a full revision is requested. I can supply a patch for that.
Change 345160 had a related patch set uploaded (by Arlolra):
[mediawiki/services/parsoid@master] T161558: Only send lints for full parse
Change 345160 merged by jenkins-bot:
[mediawiki/services/parsoid@master] T161558: Only send lints for full parse
Mentioned in SAL (#wikimedia-operations) [2017-03-29T20:31:25Z] <arlolra> Updated Parsoid to b1b27146 (T161558, T160207, T153798)
Since the deploy, there haven't been anymore of these, so let's consider this done.
There have been four like this,
{"code":"invalid-title","info":"Invalid, non-existent, or outdated title","docref":"See https://www.mediawiki.org/w/api.php for API usage. Subscribe to the mediawiki-api-announce mailing list at <https://lists.wikimedia.org/mailman/listinfo/mediawiki-api-announce> for notice of API deprecations and breaking changes."}But they all seem to be of the "outdated" variety, which seems legit.