[GH] (pekko/main): Workflow run "Nightly Aeron Tests" failed!

[GitBox <gi...@apache.org>]

The GitHub Actions job "Nightly Aeron Tests" on pekko.git/main has failed.
Run started by GitHub user jrudolph (triggered by jrudolph).

Head commit for run:
5d1b67dedfe0d947d1d69bec5ba3c78efca1d5e6 / He-Pin(kerr) <he...@gmail.com>
docs: document preMaterialize error-propagation caveat (#3272)

Motivation:
preMaterialize crosses a reactive-streams Publisher/Subscriber boundary,
which introduces a buffer and turns upstream failures into cancellations
without error details. This surprising behaviour was undocumented.

Modification:
Add the caveat to the scaladoc of every preMaterialize overload on
Source/Sink/Flow in both the Scala and Java DSLs, and to the Sink and
Source-or-Flow paradox operator pages. For consistency the caveat is also
added to the Java DSL `materializer` overloads of Sink/Source, which have
no direct upstream counterpart.

Result:
Users are clearly warned that preMaterialize buffers elements and does not
propagate upstream errors.

Tests: Not run - docs only

References:
Upstream: akka/akka-core@b7e625fb1274323afb9e8c5f0c2f4c9560cc4da1 (akka#31982), which is now Apache licensed.

Report URL: https://github.com/apache/pekko/actions/runs/28484996086

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