test: add additional regression tests for restore_metrics telemetry sync (#13843)

[Jinhaooo]

Summary

The fix for restore_metrics() telemetry desync was merged in #2736. This PR adds additional regression tests that complement the existing test_issue_2459_restore_metrics_syncs_telemetry test with edge-case coverage:

• Cost propagation: costs added via telemetry after restore land in the restored Metrics
• Stale metrics isolation: the original (pre-restore) Metrics object does not receive new costs
• Telemetry=None safety: restore_metrics() does not crash when telemetry has not been initialized
• End-to-end ConversationStats: ConversationStats restores metrics, then new costs are tracked correctly

Test plan

• All 4 new tests pass: pytest tests/sdk/llm/test_restore_metrics_telemetry_sync.py
• Existing tests unaffected: pytest tests/sdk/llm/test_llm.py

Related issue: OpenHands/OpenHands#13843

🤖 Generated with Claude Code

[VascoSch92]

Hey @Jinhaooo

Thanks for your contribution!

We actually had this bug in the SDK already, and I merged a fix this morning just before seeing your PR (see #2736 and #2459).

However, if you'd like to rebase on main, we would still love to merge the tests you wrote! :-)

[Jinhaooo]

Hi! Thanks for the heads-up! Since this is my first-ever PR, I'd be more than happy to see my tests merged into the codebase. :-) Vasco Schiavo ***@***.***> 于2026年4月10日周五 16:44写道：

…

*VascoSch92* left a comment (OpenHands/software-agent-sdk#2793) <#2793 (comment)> Hey @Jinhaooo <https://github.com/Jinhaooo> Thanks for your contribution! We actually had this bug in the SDK already, and I merged a fix this morning just before seeing your PR (see #2736 <#2736> and #2459 <#2459>). However, if you'd like to rebase on main, we would still love to merge the tests you wrote! :-) — Reply to this email directly, view it on GitHub <#2793 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BIW2UI5SLSN4OJ7VPO3H73L4VCYARAVCNFSM6AAAAACXTQWHOGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHM2DEMRSGMYDMMZVG4> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[VascoSch92]

Hi! Thanks for the heads-up! Since this is my first-ever PR, I'd be more than happy to see my tests merged into the codebase. :-) Vasco Schiavo @.> 于2026年4月10日周五 16:44写道：
…
VascoSch92 left a comment (OpenHands/software-agent-sdk#2793) <#2793 (comment)> Hey @Jinhaooo https://github.com/Jinhaooo Thanks for your contribution! We actually had this bug in the SDK already, and I merged a fix this morning just before seeing your PR (see #2736 <#2736> and #2459 <#2459>). However, if you'd like to rebase on main, we would still love to merge the tests you wrote! :-) — Reply to this email directly, view it on GitHub <#2793 (comment)>, or unsubscribe https://github.com/notifications/unsubscribe-auth/BIW2UI5SLSN4OJ7VPO3H73L4VCYARAVCNFSM6AAAAACXTQWHOGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHM2DEMRSGMYDMMZVG4 . You are receiving this because you were mentioned.Message ID: @.>

Cool... So please merge your tests with the tests I added :-).

You can ping me for a review

[Jinhaooo]

Rebased on main and removed the duplicate test. Four new test cases remain that cover scenarios not in the existing test. Ready for review @VascoSch92!

[VascoSch92]

Just one last thing and then we are good to merge. Please add these tests under my test: test_issue_2459_restore_metrics_syncs_telemetry().

[Jinhaooo]

Done! @VascoSch92