feat(telemetry): Add process tags to instrumentation telemetry

[wantsui]

What does this PR do?

Adds process tags to instrumentation telemetry for https://datadoghq.atlassian.net/browse/AIDM-255

Motivation:

https://datadoghq.atlassian.net/browse/AIDM-255

Follows the work done in #5033

The Python implementation that I followed can be found here: DataDog/dd-trace-py#15227
Change log entry

None.

Additional Notes:

How to test the change?

docker compose run --rm tracer-3.3 /bin/bash
bundle exec rspec spec/datadog/core/telemetry/integration/telemetry_spec.rb

[github-actions]

Typing analysis

Note: Ignored files are excluded from the next sections.

Untyped methods

This PR introduces 2 untyped methods and 3 partially typed methods, and clears 2 untyped methods and 1 partially typed method. It decreases the percentage of typed methods from 55.43% to 55.37% (-0.06%).

Untyped methods (+2-2)

❌ Introduced:

sig/datadog/di/probe_notification_builder.rbs:44
└── def tags: () -> untyped
sig/datadog/di/probe_notification_builder.rbs:46
└── def serialized_tags: () -> untyped

✅ Cleared:

sig/datadog/di/probe_notification_builder.rbs:42
└── def tags: () -> untyped
sig/datadog/di/probe_notification_builder.rbs:44
└── def serialized_tags: () -> untyped

Partially typed methods (+3-1)

❌ Introduced:

sig/datadog/core/telemetry/request.rbs:11
└── def self.tag_process_tags!: (Hash[Symbol, untyped] app, Core::Configuration::Settings config) -> void
sig/datadog/di/probe_notification_builder.rbs:35
└── def tag_process_tags!: (Hash[Symbol | String, untyped] payload, Core::Configuration::Settings settings) -> void
sig/datadog/di/probe_notification_builder.rbs:39
└── def get_local_variables: (TracePoint trace_point) -> Hash[Symbol,untyped]

✅ Cleared:

sig/datadog/di/probe_notification_builder.rbs:37
└── def get_local_variables: (TracePoint trace_point) -> Hash[Symbol,untyped]

If you believe a method or an attribute is rightfully untyped or partially typed, you can add # untyped:accept to the end of the line to remove it from the stats.

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-12-15 19:40:36

Comparing candidate commit ccb8959 in PR branch add-process-tags-to-telemetry with baseline commit 8b6f012 in branch master.

Found 1 performance improvements and 1 performance regressions! Performance is the same for 42 metrics, 2 unstable metrics.

scenario:profiling - Allocations ()

• 🟥 throughput [-237453.455op/s; -229850.638op/s] or [-7.118%; -6.890%]

scenario:profiling - stack collector (ruby frames - native filenames enabled)

• 🟩 throughput [+454.361op/s; +456.336op/s] or [+15.929%; +15.998%]

[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage
• Patch Coverage: 97.01%
• Overall Coverage: 95.23% (-0.01%)

View detailed report

_{This comment will be updated automatically if new data arrives.
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