[IGNORE] 🪞 #5365 - Feat/make partial flush configurable with env var

[p-datadog]

This PR mirrors the changes from the original community contribution to enable CI testing with maintainer privileges.

Original PR: #5365
Original Author: @jbdelpech
Original Branch: jbdelpech/dd-trace-rb:feat/make-partial-flush-configurable-with-env-var
Mirror Type: exact mirror (preserves original commits and signatures)

Closes #5365

---

This is an automated mirror created to run CI checks. See tooling/mirror-community-pull-request.sh for details.

[github-actions]

👋 Hey @p-datadog, please fill "Change log entry" section in the pull request description.

If changes need to be present in CHANGELOG.md you can state it this way

**Change log entry**

Yes. A brief summary to be placed into the CHANGELOG.md

(possible answers Yes/Yep/Yeah)

Or you can opt out like that

**Change log entry**

None.

(possible answers No/Nope/None)

^{Visited at: 2026-02-17 01:01:21 UTC}

[p-datadog]

https://gitlab.ddbuild.io/DataDog/apm-reliability/dd-trace-rb/-/jobs/1430353583 says:

Error: There are validation errors:
Existing Configuration Versions:
- DD_TRACE_PARTIAL_FLUSH_MIN_SPANS matches versions C

I checked java and they use version B and value of 1000, python uses 300 with no version given. I take it version needs to be set to C here?

https://feature-parity.us1.prod.dog/configurations?viewType=configurations&configSearch=DD_TRACE_PARTIAL_FLUSH_MIN_SPANS is not specifying values for any of the versions and none of the data is clickable.

[mabdinur]

Yup we can set this to version C (or we can set the default to 300 to align with python 😆 🥺)

[vpellan]

Changing the default would be a breaking change, so yes we should set it to version C

[pr-commenter]

Benchmarks

Benchmark execution time: 2026-02-17 00:39:53

Comparing candidate commit e68e2b1 in PR branch community-pr-5365 with baseline commit d943b02 in branch master.

Found 0 performance improvements and 1 performance regressions! Performance is the same for 43 metrics, 2 unstable metrics.

scenario:tracing - Tracing.log_correlation

• 🟥 throughput [-10424.724op/s; -10134.978op/s] or [-9.581%; -9.315%]

[mabdinur]

Yup we can set this to version C (or we can set the default to 300 to align with python 😆 🥺)