[CORE-16628]: Cloud Topics: HTT and more scale tests#30818
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Dedup concurrent work keyed by a path. run(key, as, work) runs the work once on the first caller (the leader) and merges later callers onto its outcome. Bounded per shard; at capacity callers run uncoordinated. Signed-off-by: Oren Leiman <oren.leiman@redpanda.com>
Concurrent reads missing the cloud cache on the same extent each issue their own S3 GET. Route read_object's cold-miss download through single_flight so one GET serves all waiters on a shard. A gate drains in-flight reads before file_io destruction. Signed-off-by: Oren Leiman <oren.leiman@redpanda.com>
Per-shard counters to gauge dedup: reads, cache_misses, and concurrent_read_merges. Plumbed through app and read-replica refreshers. Signed-off-by: Oren Leiman <oren.leiman@redpanda.com>
CDT-scale gate for the cloud-topics read-under-produce path: a steady producer writes while a large backlog drains cold from object storage, so cold fetches and L0 uploads contend for the per-shard S3 pool. Asserts produce keeps progressing, the backlog drains, and the cluster stays healthy. Sets disable_batch_cache to force the reads cold (cloud topics keep ~zero local retention). Coarse regression gate, not the reservation-vs-passthrough A/B.
stage_cloud_topics_cold_read + test_cloud_topics_cold_read: a cloud-topics analog of stage_tiered_storage_consuming that runs on a real Redpanda Cloud cluster at the sold tier (cloud topics is available there). Steady produce at max tier ingress + an RpkConsumer draining the backlog cold from oldest; asserts produce advances and the backlog drains. Backlog volume and drain timeout are calibration knobs.
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