Per-Endpoint Rate-Limit Threshold Uncertainty

Concurrent submissions to StackOverflow's public API can experience variable response latency when request volume approaches documented service boundaries. The platform enforces a per-IP rate cap that limits request volume, yet per-endpoint thresholds remain unspecified, forcing clients to infer limits through error responses. This ambiguity creates unpredictable queuing behavior under burst traffic, particularly when multiple clients target related endpoints simultaneously.

The interaction between rate-limit enforcement and database-level contention further compounds delay, as connection pool saturation may serialize requests beyond the initial rate-cap threshold.

What per-endpoint rate-limit values apply to high-frequency write operations? How does the server prioritize requests that exceed documented caps? Does concurrent request ordering affect the severity of latency penalties?