[parametric] Add version as aggregation key dimension in test_distinct_aggregationkeys_TS003

[ajgajg1134]

Summary

• Extends test_distinct_aggregationkeys_TS003 to cover version as the 7th distinct stats aggregation key dimension
• Adds a span with a per-span version meta tag (version=v1.0.0) alongside the existing 6 dimensions (service, name, resource, type, http_status_code, synthetics)
• Updates the count assertion from 7 → 8 entries

Motivation

This test was written to catch a bug in dd-trace-go v2.8.0 (DataDog/dd-trace-go#4734) where the client-side stats concentrator ignored per-span version meta tags and collapsed all spans into a version="" bucket. The bug was introduced when /info polling was added to dynamically activate client-side stats — the concentrator's aggregation key was initialized once at construction time from global config, never reading per-span version tags.

Verified:

• Test fails against current golang tracer (default latest): versioned span collapsed into same bucket (Hits=2 instead of two buckets with Hits=1)
• Test passes against the fix commit (5655505) from fix(ddtrace/tracer): wire version on aggregation key when adding a span to client-side stats dd-trace-go#4734

Test plan

• Run TEST_LIBRARY=golang ./run.sh PARAMETRIC -k test_distinct_aggregationkeys_TS003 against default tracer → FAIL (confirms bug detection)
• Run same test with binaries/golang-load-from-go-get pointing to fix commit 5655505e021b40ea2839bc8dda482ec19483047a → PASS (confirms fix validation)

🤖 Generated with Claude Code

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CODEOWNERS have been resolved as:

manifests/golang.yml                                                    @DataDog/dd-trace-go-guild
tests/parametric/test_library_tracestats.py                             @DataDog/system-tests-core @DataDog/apm-sdk-capabilities

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⚠️ Warnings

🚦 5 Pipeline jobs failed

Testing the test | System Tests (dotnet, dev) / parametric / parametric (1)     

🧪 1 Test failed

tests.parametric.test_library_tracestats.Test_Library_Tracestats.test_distinct_aggregationkeys_TS003[agent_env0-library_env0, parametric-dotnet] from system_tests_suite  

assert 2 == 1

self = <tests.parametric.test_library_tracestats.Test_Library_Tracestats object at 0x7f1c88b38350>
test_agent = <utils.docker_fixtures._test_agent.TestAgentAPI object at 0x7f1c56921370>
test_library = <utils.docker_fixtures._test_clients._test_client_parametric.ParametricTestClientApi object at 0x7f1c561b1880>

    @enable_tracestats()
    @enable_agent_version()
    def test_distinct_aggregationkeys_TS003(self, test_agent: TestAgentAPI, test_library: APMLibrary):
        """When spans are created with a unique set of dimensions
...

Testing the test | System Tests (dotnet, prod) / parametric / parametric (1)     

🧪 1 Test failed

tests.parametric.test_library_tracestats.Test_Library_Tracestats.test_distinct_aggregationkeys_TS003[agent_env0-library_env0, parametric-dotnet] from system_tests_suite  

assert 2 == 1

self = <tests.parametric.test_library_tracestats.Test_Library_Tracestats object at 0x7f86761bf6b0>
test_agent = <utils.docker_fixtures._test_agent.TestAgentAPI object at 0x7f86436a6450>
test_library = <utils.docker_fixtures._test_clients._test_client_parametric.ParametricTestClientApi object at 0x7f8643606630>

    @enable_tracestats()
    @enable_agent_version()
    def test_distinct_aggregationkeys_TS003(self, test_agent: TestAgentAPI, test_library: APMLibrary):
        """When spans are created with a unique set of dimensions
...

Testing the test | System Tests (java, dev) / parametric / parametric (1)     

🧪 1 Test failed

tests.parametric.test_library_tracestats.Test_Library_Tracestats.test_distinct_aggregationkeys_TS003[agent_env0-library_env0, parametric-java] from system_tests_suite  

assert 2 == 1

self = <tests.parametric.test_library_tracestats.Test_Library_Tracestats object at 0x7feba9277ad0>
test_agent = <utils.docker_fixtures._test_agent.TestAgentAPI object at 0x7feb74ee8b00>
test_library = <utils.docker_fixtures._test_clients._test_client_parametric.ParametricTestClientApi object at 0x7feb74ef7dd0>

    @enable_tracestats()
    @enable_agent_version()
    def test_distinct_aggregationkeys_TS003(self, test_agent: TestAgentAPI, test_library: APMLibrary):
        """When spans are created with a unique set of dimensions
...

View all 5 failed jobs.

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❄️ No new flaky tests detected

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