private void writeNumDroppedConnectionsLog() {
            loggingScheduled.set(false);

            final long dropped = numDroppedConnections.sumThenReset();
            if (dropped > 0) {
                logger.warn("Dropped {} connection(s) to limit the number of open connections to {}",
                            dropped, maxNumConnections);
            }
        }
Validates the maximum allowed number of open connections. It must be a positive number.
core/src/main/java/com/linecorp/armeria/server/ConnectionLimitingHandler.java