# Rally 2.12.0

**URL:** <https://discuss.elastic.co/t/rally-2-12-0/376601>\
**Category:** Announcements\
**Tags:** docker\
**Created:** [March 31, 2025, 10:17pm UTC](https://discuss.elastic.co/t/rally-2-12-0/376601 "2025-03-31T22:17:44Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![dpifke-elastic](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dpifke-elastic/32/125868_2.png) [@dpifke-elastic](https://discuss.elastic.co/u/dpifke-elastic)\
**Post date:** [March 31, 2025, 10:17pm UTC](https://discuss.elastic.co/t/rally-2-12-0/376601/1 "2025-03-31T22:17:44Z")

</div>

### Rally 2.12.0 is released!

#### Highlights

- [#1917](https://github.com/elastic/rally/pull/1917): Upgrade thespian to 4.0.1
- [#1912](https://github.com/elastic/rally/pull/1912): Preserve pre-existing rally-metrics index templates by default
- [#1893](https://github.com/elastic/rally/pull/1893) (Breaking): feat: Drop support for Python 3.8 [ES-8947]

#### Enhancements

- [#1932](https://github.com/elastic/rally/pull/1932): issue #1931: create-track command supports serverless.
- [#1924](https://github.com/elastic/rally/pull/1924): Introduce tools for pretty printing JSON like objects and their differences.
- [#1909](https://github.com/elastic/rally/pull/1909): Add check if headers is not None before treating it like a dict
- [#1908](https://github.com/elastic/rally/pull/1908): Improve error messages regarding track syntax errors
- [#1892](https://github.com/elastic/rally/pull/1892): feat: Add a parallel JSON log by default
- [#1885](https://github.com/elastic/rally/pull/1885): feat: Add ability to run esrallyd inside docker [ES-9146]

#### Bug Fixes

- [#1919](https://github.com/elastic/rally/pull/1919): Suppress a flaky internal mypy error appearing randomly when executing make lint.
- [#1913](https://github.com/elastic/rally/pull/1913): Add ability to provide a list as input for disk-usage-stats
- [#1904](https://github.com/elastic/rally/pull/1904): Reduce log volume forwarded through Thespian framework
- [#1896](https://github.com/elastic/rally/pull/1896): Add read timeout for retry
- [#1891](https://github.com/elastic/rally/pull/1891): fix: Use named parameter for \_to\_datetime to pass default\_tz
- [#1888](https://github.com/elastic/rally/pull/1888): fix: Release docker script fix - use echo not git

#### Miscellaneous Changes

- [#1929](https://github.com/elastic/rally/pull/1929): Upgrade google-auth to 2.38.0
- [#1922](https://github.com/elastic/rally/pull/1922): Implements a decorator to facilitate creating table-driven unit tests.
- [#1911](https://github.com/elastic/rally/pull/1911): Replace deprecate use of resources.read\_text() function.
- [#1899](https://github.com/elastic/rally/pull/1899): Bump jinja2 from 3.1.4 to 3.1.5