@Nullable
    default Integer maxNumConnections() {
        return null;
    }
Returns the default server-side maximum number of connections.
Note that this flag has no effect if a user specified the value explicitly via
{@link ServerBuilder#maxNumConnections(int)}.

<p>The default value of this flag is {@value DefaultFlagsProvider#MAX_NUM_CONNECTIONS}. Specify the
{@code -Dcom.linecorp.armeria.maxNumConnections=<integer>} JVM option to override
the default value.
core/src/main/java/com/linecorp/armeria/common/FlagsProvider.java