private static void logOneWayFunctionFailure(@Nullable RequestContext ctx, Throwable cause) {
        if (ctx != null) {
            logger.warn("{} Unexpected exception from a one-way function:", ctx, cause);
        } else {
            // Should never reach here, but for completeness.
            logger.warn("Unexpected exception from a one-way function:", cause);
        }
    }
Returns the information about the Thrift services being served.

@return a {@link Map} whose key is a service name, which could be an empty string if this service
        is not multiplexed
thrift/thrift0.21/src/main/java/com/linecorp/armeria/server/thrift/ThriftCallService.java