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Is the sequence number in Header message deprecated

Hi all,

At the moment I am trying to understand whether the sequence number in the ROS header message is now deprecated. I got this message on ROS answers but cannot look at the original issue. . When looking at the spec it does not talk of it being deprecated. Is it needed?

It is deprecated, but we’ve avoided removing it to prevent unnecessary disruption between releases.
I summarized a bit of the history in this GitHub comment:

Ultimately, it was decided that we would remove it in ROS 2:

However, I’m not certain whether or not we’ll ever do so in ROS 1.

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Thank you that’s great information.