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The message exceeds PubSub’s per-message attribute limits: 100 attributes (all 100 for the user, or 99 with publish.uidAttribute), 256 bytes per key, 1024 bytes per value. Non-string values are refused here too — PubSub attributes are strings, and filters compare them as strings. Fix — publish the value in the payload instead, or shorten it. Filter attributes should stay short and low-cardinality.

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