Robustness Regression test for #18667

[serathius]

What would you like to be added?

What would you like to be added?

A command like make test-robustness-issue14685 for #18667

Example #18099

How to start:

• Follow https://github.com/etcd-io/etcd/tree/main/tests/robustness
• Try command like make test-robustness-issue14370 to see how it should work

Requirement:

• Add command make test-robustness-issue15220
• The command should pick an old etcd version that is affected (read the issue Requested watcher progress notifications are not synchronised with stream #15220). Patch might be needed for repro (ask @serathius if needed)
• Running command should reproduce the failure within ~100 runs
• Update https://github.com/etcd-io/etcd/tree/main/tests/robustness#robustness-track-record with the command

Why is this needed?

Ensure we maintain reprodudability of historical issues.