[jdk8u-dev] RFR: 8220658: Improve the readability of container information in the error log

[Jonathan Dowland]

This ([8220658]) is a low-risk change which improves the readability of some debug values reported to humans. I wish to backport this to 8u partly for Oracle parity, and partly because I intend to backport [8284758], which refactors and moves most of  the code introduced here to another routine.

Doing 8220658 first will ease 8284758 (reduced merge conflicts). Not doing 8220658 (and later backporting 8284758) will result in some of this code making it into 8u (the refactored bits) but not all (the improved cpu quota etc reporting)

Patch is not clean due to path differences but otherwise applied without conflicts or fuzz. Builds and smoke tests fine. I've had some trouble running tier1 locally (OOMed my workstation) so I'm going to watch for the GitHub bot results whilst I retry.

[8220658]: https://bugs.openjdk.org/browse/JDK-8220658
[8284758]: https://bugs.openjdk.org/browse/JDK-8284758

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Commit messages:
 - 8220658: Improve the readability of container information in the error log

Changes: https://git.openjdk.org/jdk8u-dev/pull/723/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=723&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8220658
  Stats: 54 lines in 1 file changed: 41 ins; 0 del; 13 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/723.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/723/head:pull/723

PR: https://git.openjdk.org/jdk8u-dev/pull/723