For last several months there were increased number of developers reporting issues with iCloud sync APIs.

Mostly, this results in significant number of 503 errors accessing iCloud APIs.

Some developers who created in-app status panels for iCloud status, see issues.

Apple did not yet come back with resolutions or recommendations.

As of January 26 Apple’s System Status shows some issues as resolved.

Reference:

Recommendations

Developer:

Check iCloud API usage carefully. Have graceful fallbacks in place.

QA engineer:

Beware of iCloud issues, report inconsistent behavior to development team.

PM/DM:

Beware of potential issues with iCloud backend, prepare corresponding communications to users.

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