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The issue was that a downstream 3rd party service couldn't handle the Black Friday load when all clients elevated simultaneously. We added a component to limit the concurrency to that service and the issue appears to be resolved.
The issue has been identified and the fix is applied. We expect the data processing to catch up in about an hour. We are continuing to monitor it.
We observe the delay in data ingestion and processing. Continuous and triggered campaigns are delayed. One-time send campaigns going out as normal. We continue investigating the issue.
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