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[DIAGNOSTIC] README: HTTPS link upgrade — observing required-check behavior#144

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[DIAGNOSTIC] README: HTTPS link upgrade — observing required-check behavior#144
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What this is

A purpose-built diagnostic PR to isolate whether the multi-hour hang on the required full-build-java-tests and full-build-cppunit-tests jobs is:

  1. Triggered by the code change in PR Skip synchronous snapshot during leader election to unblock quorum formation #140 (skip-snapshot leader-election optimization), or
  2. A pre-existing infrastructure / runner / flaky-test issue on branch-3.6's self-hosted runners

Change

README.md: one character — http://zookeeper.apache.org/https://. Zero touch on Java, build config, tests, or anything else.

What we expect to learn

Local-suite baseline (for reference, not asserted on this PR)

On commit c7569c237 (PR #140 HEAD), full mvn -Pfull-build verify ran locally in 28 min with forkcount=4: 3,184 / 3,187 tests pass. Three "failures" all have non-code root causes (JMockit/log4j classpath quirk side effect, forkcount=4 concurrency artifact, fork-specific BackupManager flake).

After

Will close this PR after the data point is collected.

🤖 Generated with Claude Code

Diagnostic-only one-character HTTPS upgrade. The point of this PR is
to observe whether the 4 required full-build-* tests on this repo
exhibit the same multi-hour hang behavior we see on PR #140 when the
underlying change is unambiguously trivial. If yes, the CI runner /
test flakiness is unrelated to that PR and we can route accordingly
with the ZK team.

Will close this PR once the data point is collected.
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