Add DSM Integration to the Waterdrop instrumentation

[ericfirth]

This is one commit on top of the Waterdrop PR (here: #4874) to add DSM to the Waterdrop instrumentation

What does this PR do?
This PR adds DSM instrumentation to Waterdrop ensuring that if DSM is enabled and they use the Karafka ecosystem, a customer can have DSM through their architecture

Motivation:
Adding DSM to Ruby and all design partners use Waterdrop

Change log entry

Yes. Waterdrop producers are compatible with Data Streams Monitoring (DSM)

Additional Notes:

How to test the change?

[github-actions]

Thank you for updating Change log entry section 👏

^{Visited at: 2025-11-14 19:59:42 UTC}

[github-actions]

Typing analysis

This PR does not change typing compared to the base branch.

[datadog-official]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage
• Patch Coverage: 91.49%
• Total Coverage: 98.36% (-0.11%)

View detailed report

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[pr-commenter]

Benchmarks

Benchmark execution time: 2025-11-17 15:57:53

Comparing candidate commit 604731a in PR branch eric.firth/add-waterdrop-dsm-integration with baseline commit 49cee89 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 44 metrics, 2 unstable metrics.

[Strech]

I left a question about the footprint in case we don't have data streams activated.

P.S Please fill in the PR template

[vpellan]

LGTM! (with a non blocker comment)