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## Problem Currently PG backpressure parameters are enforced globally. With tenant splitting, this makes it hard to balance small tenants and large tenants. For large tenants with more shards, we need to increase the lagging because each shard receives total/shard_count amount of data, while doing so could be suboptimal to small tenants with fewer shards. ## Summary of changes This PR makes these parameters to be enforced at the shard level, i.e., PG will compute the actual lag limit by multiply the shard count. ## How is this tested? Added regression test. Co-authored-by: Chen Luo <chen.luo@databricks.com>