@ovasileva do you have the code we have to add to the pages handy?
From the docs (https://developers.google.com/search/docs/advanced/robots/robots_meta_tag#max-snippet)

To allow up to 20 characters to be shown in the snippet:

<meta name="robots" content="max-snippet:20">

To specify that there's no limit on the number of characters that can be shown in the snippet:

<meta name="robots" content="max-snippet:-1">

which one are we using for the purpose of the A/B test?

In T299133#7669318, @Jdlrobson wrote:

@ovasileva do you have the code we have to add to the pages handy?
From the docs (https://developers.google.com/search/docs/advanced/robots/robots_meta_tag#max-snippet)

To allow up to 20 characters to be shown in the snippet:

<meta name="robots" content="max-snippet:20">

To specify that there's no limit on the number of characters that can be shown in the snippet:

<meta name="robots" content="max-snippet:-1">

which one are we using for the purpose of the A/B test?

@jrobson - we would like the limit to be 400 characters, so <meta name="robots" content="max-snippet:400"> vs not having the tag at all

@ovasileva to check what happened here with partnerships and decide whether this can be declined/resolved.
~~We should also evaluate whether this code should be retained or removed before closing out: https://gerrit.wikimedia.org/g/mediawiki/core/+/f6af87d3353a1791ba497f144b29d4217dce05a8/tests/phpunit/includes/Output/OutputPageTest.php#749~~ looks like no code cleanup needed here. It appears to have already happened.