batchAcrossTopics

Whether to allow batching messages from different MQTT topics into a single HTTP request. By default, only messages from the same topic are batched together. The default value is false.

When batchAcrossTopics is enabled, the error payload format changes: the topic field moves from the top level to inside each entry in the payloadsWithMetadata array, since each message in the batch may originate from a different topic.

Messages are always batched within the scope of the same account, rule name, target HTTP endpoint URL, and billing group. Messages that differ in any of these attributes are never combined into the same batch, regardless of the batchAcrossTopics setting.