Task report generation fails with GraphZipper error

[Visoschi Marian-Catalin]

On rally-openstack v2.3.0 task report generation fails for complex reports with Unhandled error: RuntimeError: GraphZipper is already full. You can't add more points.

This error is random and doesn't always appear, but for more complex tasks it is pretty common.

StackTrace:

2023-12-04 10:15:34.844 1 INFO rally.api [-] Building 'html' report for the following task(s): 'b71d7e0d-8701-435e-baba-3fcf278b7247'.
Command failed, please check log for more info
2023-12-04 10:15:34.945 1 CRITICAL rally [-] Unhandled error: RuntimeError: GraphZipper is already full. You can't add more points.
2023-12-04 10:15:34.945 1 ERROR rally Traceback (most recent call last):
2023-12-04 10:15:34.945 1 ERROR rally File "/usr/local/bin/rally", line 8, in <module>
2023-12-04 10:15:34.945 1 ERROR rally sys.exit(main())
2023-12-04 10:15:34.945 1 ERROR rally File "/usr/local/lib/python3.9/site-packages/rally/cli/main.py", line 40, in main
2023-12-04 10:15:34.945 1 ERROR rally return cliutils.run(sys.argv, categories)
2023-12-04 10:15:34.945 1 ERROR rally File "/usr/local/lib/python3.9/site-packages/rally/cli/cliutils.py", line 667, in run
2023-12-04 10:15:34.945 1 ERROR rally ret = fn(*fn_args, **fn_kwargs)
2023-12-04 10:15:34.945 1 ERROR rally File "/usr/local/lib/python3.9/site-packages/rally/cli/envutils.py", line 142, in inner
2023-12-04 10:15:34.945 1 ERROR rally return func(*args, **kwargs)
2023-12-04 10:15:34.945 1 ERROR rally File "/usr/local/lib/python3.9/site-packages/rally/cli/commands/task.py", line 667, in report
2023-12-04 10:15:34.945 1 ERROR rally self.export(api, tasks=tasks,
2023-12-04 10:15:34.945 1 ERROR rally File "/usr/local/lib/python3.9/site-packages/rally/cli/envutils.py", line 142, in inner
2023-12-04 10:15:34.945 1 ERROR rally return func(*args, **kwargs)
2023-12-04 10:15:34.945 1 ERROR rally File "/usr/local/lib/python3.9/site-packages/rally/plugins/__init__.py", line 59, in wrapper
2023-12-04 10:15:34.945 1 ERROR rally return func(*args, **kwargs)
2023-12-04 10:15:34.945 1 ERROR rally File "/usr/local/lib/python3.9/site-packages/rally/cli/commands/task.py", line 777, in export

This bug only affects rally-openstack v2.3.0. We downgraded to v2.2.0 and the bug is not present anymore.
For more information please contact me on: <email address hidden>