slachiewicz opened a new pull request, #12700:
URL: https://github.com/apache/maven/pull/12700

   Reverts b47bcec09c3906c71a8696e6ffb763c65f5f9a32, which commented out the 
`mimir.session.mirrors` line in `.github/ci-mimir-session.properties`.
   
   ### Why it was commented out
   
   The Google Cloud mirror of Central lags a fresh release. 
`apache-maven-4.0.0-rc-6` was still a 404 there days after Central served it, 
which broke CI during the rc-6 rollout.
   
   ### Why restore it now
   
   The mirror has caught up — both of these are 200 today:
   
   | URL | status |
   | --- | --- |
   | 
`https://maven-central.storage-download.googleapis.com/maven2/.../apache-maven-4.0.0-rc-6.pom`
 | 200 |
   | `https://repo1.maven.org/maven2/.../apache-maven-4.0.0-rc-6.pom` | 200 |
   
   The mirror is cheaper for CI than hitting Central directly on every job, and 
the lag is a release-day problem rather than a steady-state one — so the mirror 
is the better default between releases.
   
   ### Caveat worth knowing
   
   This does re-expose CI to the same 404 window when the next RC drops. If 
that happens, commenting the line out again is a one-line change.
   
   A matching PR for `maven-4.0.x` follows, since that branch carries the same 
commit (c05b25dda5).


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