This core change is required for Campaign Mixins:

https://gerrit.wikimedia.org/r/#/c/202925/

It changes a method signature that's overridden in several extensions, including CentralNotice. Coordinated patches are ready for all those extensions:

https://gerrit.wikimedia.org/r/#q,I0a10fb0cbf17d095ece493e744296caf13dcee02,n,z
https://gerrit.wikimedia.org/r/#q,I67e957f74d6ca48cfb9a41fb5144bcc78f885e50,n,z
https://gerrit.wikimedia.org/r/#q,Ica3ba32aa2fc76d11a44f391b6edfc871e7fbe0d,n,z
https://gerrit.wikimedia.org/r/#q,Ic63e617f51702c27104e123d4bed91983a726b7f,n,z
https://gerrit.wikimedia.org/r/#q,I0ac775ca286e64825e31a9213b94648e41a5bc30,n,z
https://gerrit.wikimedia.org/r/#q,I816bffa3815e2eab7e88cb04d1b345070e6aa15f,n,z

The best approach will probably to both merge (to master or whatever the beta cluster is synced to) and deploy all of these together.