RFR: 8366951: Test runtime/logging/StressAsyncUL.java is timing out

[Johan Sjölen]

Hi,

This test times out sometimes. This has been known to be caused previously by a resource-constrained execution environment. It may also be because of a race between async logging initialization and the loggers (see JDK-8362282).

This PR reduces the stress by changing the log level from `trace` to `debug`. This changes the amount of logging from 48M to 6.6M, a significant reduction.

The goal with the test was to find out if there are any bugs in the stalling mode by running it in a 'stressful' situation over a long time. The stalling mode was integrated in 2025-02-26 (see https://github.com/openjdk/jdk/pull/22770 ). I therefore believe that relaxing this test is in our interest, as it reduces the stress on our CICD infra.

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Commit messages:
 - Change to debug

Changes: https://git.openjdk.org/jdk/pull/27195/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27195&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366951
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/27195.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27195/head:pull/27195

PR: https://git.openjdk.org/jdk/pull/27195