An. IoT system streams data to a Cloud Pub/Sub topic for ingestion, and the data is processed in a Cloud Dataflow pipeline before being written to Cloud Bigtable. Latency is increasing as more data is added, even though nodes are not at maximum utilization. What would you look for first as a possible cause of this problem?

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An. IoT system streams data to a Cloud Pub/Sub topic for ingestion, and the data is processed in a Cloud Dataflow pipeline before being written to Cloud Bigtable. Latency is increasing as more data is added, even though nodes are not at maximum utilization. What would you look for first as a possible cause of this problem?