RFR: 8345684: OperatingSystemMXBean.getSystemCpuLoad() throws NPE [v3]

[Fabian Meumertzheim]

> The return value of Metrics#getCpuSetCpus may change over time, including from non-null to null across the two calls in this method.

Fabian Meumertzheim has updated the pull request incrementally with one additional commit since the last revision:

  Empty commit to trigger CI checks

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22611/files
  - new: https://git.openjdk.org/jdk/pull/22611/files/30d1b03b..0364f6b5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22611&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22611&range=01-02

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/22611.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22611/head:pull/22611

PR: https://git.openjdk.org/jdk/pull/22611