Propagate statsd client to stats concentrator (APMSP-1631)

[ajgajg1134]

What does this PR do?

Propagate statsd client to stats concentrator so we can emit health metrics about stats.

Motivation

Turns out these stats were never actually being written as the client was always a noopClient

Reviewer's Checklist

• Changed code has unit tests for its functionality at or near 100% coverage.
• System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
• There is a benchmark for any new code, or changes to existing code.
• If this interacts with the agent in a new way, a system test has been added.
• Add an appropriate team label so this PR gets put in the right place for the release notes.
• Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild.
• For internal contributors, a matching PR should be created to the v2-dev branch and reviewed by @DataDog/apm-go.

Unsure? Have a question? Request a review!

[ajgajg1134]

it looks like the smoke test failure here is due to be fixed here? #3006

[datadog-datadog-prod-us1]

Datadog Report

Branch report: andrew.glaude/statsmetrics
Commit report: 99cb26a
Test service: dd-trace-go

✅ 0 Failed, 5094 Passed, 67 Skipped, 2m 50.84s Total Time

[hannahkm]

thanks!

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-12-04 19:56:45

Comparing candidate commit 7cd5754 in PR branch andrew.glaude/statsmetrics with baseline commit 9980c24 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 58 metrics, 1 unstable metrics.

[darccio]

Edit: now I saw @ajgajg1134 comment about this:

cannot use t.statsd (variable of type "gopkg.in/DataDog/dd-trace-go.v1/internal".StatsdClient) as runtimemetrics.partialStatsdClientInterface value in argument to runtimemetrics.Start: "gopkg.in/DataDog/dd-trace-go.v1/internal".StatsdClient does not implement runtimemetrics.partialStatsdClientInterface (missing method DistributionSamples)

Edit 2: And now I see why. github.com/DataDog/go-runtime-metrics-internal package introduced a breaking change in a commit we are not pulling yet in our go.mod, but smoke tests do. That's why they fail. I'm reviewing and accepting #3006 to fix that.