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Follow-up to #589 to make the default std err logs more usable

jruby-rack and jruby in general can often log large backtraces and such inside logging messages, which Jetty's default stderrlog will escape in a way that makes them unreadable.

Users who need a "proper" logging solution are better to switch to SLF4J logging anyway, which requires a jar implementation to be added into warbler and some webserver.properties configuration. We can address this to work-by-default for a Jetty 10+ upgrade where this older StdErr logging approach is gone (see jetty/jetty.project#4572).

@chadlwilson chadlwilson added this to the 2.1.1 milestone Oct 28, 2025
@chadlwilson chadlwilson marked this pull request as draft October 28, 2025 10:29
@chadlwilson chadlwilson marked this pull request as ready for review October 28, 2025 11:18
@chadlwilson chadlwilson merged commit f9ff419 into jruby:master Oct 28, 2025
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@chadlwilson chadlwilson deleted the disable-log-escaping branch October 28, 2025 11:18
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