Unable to set deliver_at_time via SerializeMessage trait?

[chamons]

The internal ProducerMessage struct has a field:

    /// UTC Unix timestamp in milliseconds, time at which the message should be
    /// delivered to consumers
    pub deliver_at_time: ::std::option::Option<i64>,

That today appears to be only settable via the MessageBuilder abstraction. If you implement SerializeMessage yourself, I don't see a way to set it.

Since SerializeMessage produces the public producer::Message, which doesn't have a deliver_at_time, I think you are forced to use MessageBuilder.

Is this expected or a bug?

[chamons]

If this is not expected, would the team be up for a PR to fix this?

[chamons]

This appears trivial to fix so I just made the PR -#337

[chamons]

Closed via #337