Duplicate path and unknown BGP4MP record subtype 9 warnings

[ChroDevTo]

Currently when using pybgpstream on data newer than 2022 I get the a ton of warnings like in the attached screenshot. What is that? I am currently trying to do research on how the amount of BGP updates changed over the years on different collectors and I am not sure if my count is off because of this.

[tobez]

Subtype 9 is BGP4MP_MESSAGE_AS4_ADDPATH (https://www.rfc-editor.org/rfc/rfc8050#section-3). Does not seem to be supported currently.

Can you share an example (a link to) of an update file you are seeing this with?

[ChroDevTo]

I am currently working on data from the 01/06/2022 and the warning comes basically all the time.

[ChroDevTo]

These warnings appear too over the same timeframe. If I have time later I will search an update file