@Legoktm @greg, adding the teams SRE and Release-Engineering-Team as I'm not sure who exactly would be in charge of this. Since @Lea_WMDE is currently on leave, please poke me, @Bmueller or @Addshore if you have any questions.

We need to update the package on apt.wikimedia.org, then it's available on the beta cluster and can be upgraded there. Initially it'll be added to the experimental component.

Which wikidiff2 commits need to be cherrypicked (a1d711ebb5ce6bde66b2e4b1e650318a166895d6 ?, but that one's from 2016?) ? Or will there be a 1.4.2 release?

I believe you need both 410ab2ff636eed296206b80a3c89aa75a50b0f8a and a1d711ebb5ce6bde66b2e4b1e650318a166895d6.
The dates are from 2016 as that is when the patches were started but they were only merged in the past days!

This should definitely be a new version, 1.5.

I tagged 1.5.0, and prepared packaging changes:

• Merge tag '1.5.0' into debian - https://gerrit.wikimedia.org/r/#/c/377809/
• Update debian/changelog for 1.5.0 - https://gerrit.wikimedia.org/r/#/c/377810/

I cherrypicked the two commits into a 1.4.1+wmf2 package, uploaded that to the experimental section of apt.wikimedia.org/jessie-wikimedia.

deployment-mediawiki04-deployment-mediawiki06 in the Beta cluster have been upgraded along with an HHVM restart. Let me know if there's other systems relavent to your tests which need to be upgraded in deployment-prep.

When your tests are successful and have been confirmed to work fine, we can bump the package to the 1.5.0 release for the rollout in production (starting with the canary app servers first).

@MoritzMuehlenhoff great, thanks!
I think what's still missing is setting $wgWikiDiff2MovedParagraphDetectionCutoff = 25; for the beta wikis to actually see the new behavior. With that set to 0 (default) the diff will just work as before.

In T175818#3610041, @Tobi_WMDE_SW wrote:

@MoritzMuehlenhoff great, thanks!
I think what's still missing is setting $wgWikiDiff2MovedParagraphDetectionCutoff = 25; for the beta wikis to actually see the new behavior. With that set to 0 (default) the diff will just work as before.

I should be able to do that today :)

@Addshore yay, great!

Change 378235 had a related patch set uploaded (by Addshore; owner: Addshore):
[operations/mediawiki-config@master] beta: $wgWikiDiff2MovedParagraphDetectionCutoff = 25

https://gerrit.wikimedia.org/r/378235

Change 378235 merged by jenkins-bot:
[operations/mediawiki-config@master] beta: $wgWikiDiff2MovedParagraphDetectionCutoff = 25

https://gerrit.wikimedia.org/r/378235

Now set on beta!

Confirming that it seems to work: https://en.wikipedia.beta.wmflabs.org/w/index.php?title=User%3ATobias_Gritschacher%2FMoveParagraphTests&type=revision&diff=370894&oldid=370893#movedpara_3_1_lhs

@Tobi_WMDE_SW : The task description mentions "after testing the new behavior on beta, deploy the new version of wikidiff2 in production but leave $wgWikiDiff2MovedParagraphDetectionCutoff = 0; to not enable it yet. Ticket will be created by WMDE's Technical Wishes Team as soon as we are finished with testing." When that's ready, you can assign the ticket for the rollout to me.