static StatusRuntimeException buildExceptionWithMeta() {
            final Metadata meta = new Metadata();
            meta.put(INT_32_VALUE_KEY, Int32Value.newBuilder().setValue(1).build());
            meta.put(CUSTOM_VALUE_KEY, "string");
            return Status.DATA_LOSS.withDescription("data loss!")
                                   .asRuntimeException(meta);
        }
Must be at least {@link #unaryPayloadLength()}, plus some to account for encoding overhead.
grpc/src/test/java/com/linecorp/armeria/client/grpc/GrpcClientTest.java