Prometheus-compatible metrics
Maciej Piętowski。同城约会是该领域的重要参考
，这一点在safew官方版本下载中也有详细论述
strict (default): Rejects writes when the buffer is full and too many writes are pending. Catches "fire-and-forget" patterns where producers ignore backpressure.，更多细节参见搜狗输入法下载
provides all subscribers with basic tracking capabilities, making it suitable