chore(config): migrate APM stats encoder to typed configuration

[webern]

Summary

Migrate the Datadog APM Stats encoder to typed traces and shared configuration. The encoder now receives the resolved environment and flush timeout directly, while raw deserialization and legacy smoke-test ownership are removed.

Change Type

• Non-functional (chore, refactoring, docs)

How did you test this PR?

• make fmt
• make check-docs
• make check-clippy
• make check-all
• cargo check -p saluki-components -p agent-data-plane -p datadog-agent-config-overlay-model --tests

References

• Progresses Migrate saluki codebase to typed configuration. #2169
• Progresses Migrate APM traces to typed configuration. #2193

[webern]

• chore(config): migrate APM stats encoder to typed configuration #2266 👈 (View in Graphite)
• chore(config): migrate APM stats transform to typed config #2265
• chore(config): migrate OTTL transform to typed configuration #2263
• chore(config): migrate OTTL filter to typed configuration #2262
• chore(config): migrate trace obfuscation to typed configuration #2261
• chore(config): use typed OTLP traces configuration #2260
• chore(config): migrate trace sampler to typed configuration #2191
• chore(config): migrate datadog trace encoder to typed configuration #2187
• main

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[pr-commenter]

Binary Size Analysis (Agent Data Plane)

Baseline: c07a446 · Comparison: 1abf698 · diff
Analysis Configuration: stripped binaries · Pass/Fail Threshold: +5%
Sizes: 41.39 MiB (baseline) vs 41.31 MiB (comparison)
Size Change: -85.77 KiB (-0.20%)

✅ Binary size difference within threshold

Changes by Module

Module	File Size	Symbols
figment	-138.30 KiB	80
core	+46.10 KiB	1871
saluki_components::common::datadog	+33.49 KiB	63
serde	-20.54 KiB	27
anon.9f7fcabd42bdb20c281b9db2ecef43c6.574.llvm.17066318201269722550	+17.62 KiB	1
anon.d25442021e55207a1dc52a0783b8a331.602.llvm.11360328729134350799	-17.61 KiB	1
prost	+14.35 KiB	225
piecemeal	-14.31 KiB	18
anon.9f7fcabd42bdb20c281b9db2ecef43c6.687.llvm.17066318201269722550	+12.37 KiB	1
anon.d25442021e55207a1dc52a0783b8a331.713.llvm.11360328729134350799	-12.37 KiB	1
tonic	+10.41 KiB	61
agent_data_plane_config::_::_<impl serde_core	+10.12 KiB	1
anon.d25442021e55207a1dc52a0783b8a331.146.llvm.11360328729134350799	-9.71 KiB	1
quick_cache	-9.63 KiB	19
anon.9f7fcabd42bdb20c281b9db2ecef43c6.145.llvm.17066318201269722550	+9.62 KiB	1
std	+9.55 KiB	67
otlp_protos::otlp_include::opentelemetry	-9.15 KiB	124
anon.d25442021e55207a1dc52a0783b8a331.599.llvm.11360328729134350799	-9.15 KiB	1
anon.9f7fcabd42bdb20c281b9db2ecef43c6.571.llvm.17066318201269722550	+9.06 KiB	1
anon.9f7fcabd42bdb20c281b9db2ecef43c6.28.llvm.17066318201269722550	+9.01 KiB	1

Detailed Symbol Changes

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +1.1% +99.2Ki  +1.0% +63.9Ki    [10173 Others]
  [NEW] +37.4Ki  [NEW] +37.1Ki    _<saluki_components::common::datadog::config::_::<impl serde_core::de::Deserialize for saluki_components::common::datadog::config::ForwarderConfiguration>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::hfdfd1ef0ed851a0a
  [NEW] +17.6Ki  [NEW]     +76    anon.9f7fcabd42bdb20c281b9db2ecef43c6.574.llvm.17066318201269722550
  +248% +15.8Ki  +252% +15.8Ki    h2::proto::connection::DynConnection<B>::recv_frame::h09d92c074afb400d
  [NEW] +12.4Ki  [NEW]     +81    anon.9f7fcabd42bdb20c281b9db2ecef43c6.687.llvm.17066318201269722550
  [DEL] -10.9Ki  [DEL] -10.8Ki    saluki_components::sources::otlp::logs::transform::transform_log_record::h2af58f29efba97f7
 -55.5% -11.0Ki -56.0% -11.0Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::h6abd0fc21cbbc508
  [DEL] -12.1Ki  [DEL] -12.0Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::hffc30f6995b0d94e
 -55.2% -12.4Ki -55.6% -12.4Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::h70e2afbf0bb450d6
  [DEL] -12.4Ki  [DEL]     -81    anon.d25442021e55207a1dc52a0783b8a331.713.llvm.11360328729134350799
 -93.3% -14.6Ki -94.2% -14.6Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_any::h9c01161bf3a4a364
 -55.6% -14.7Ki -55.9% -14.7Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::h620744619ca067ad
 -55.6% -14.7Ki -55.9% -14.7Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::ha466ba9027a7db13
  [DEL] -14.9Ki  [DEL] -14.7Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::hdae07b7ea010b6fb
  [DEL] -17.6Ki  [DEL]     -76    anon.d25442021e55207a1dc52a0783b8a331.602.llvm.11360328729134350799
  [DEL] -17.7Ki  [DEL] -17.5Ki    _<otlp_protos::otlp_include::opentelemetry::proto::collector::metrics::v1::ExportMetricsServiceRequest as prost::message::Message>::encode_raw::hb140c0447fb18ee8
  [DEL] -19.0Ki  [DEL] -18.9Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::hf32fb3e80e974af1
  [DEL] -21.1Ki  [DEL] -20.8Ki    _<otlp_protos::otlp_include::opentelemetry::proto::collector::metrics::v1::ExportMetricsServiceRequest as prost::message::Message>::encode_raw::hc9fac3147d76049d
  [DEL] -21.6Ki  [DEL] -21.5Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::h1be15f59da19991b
  [DEL] -24.9Ki  [DEL] -24.7Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::ha14640b20f74d1e4
  [DEL] -28.6Ki  [DEL] -28.4Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::h8152b7ae42bbdf3b
  -0.2% -85.8Ki  -0.3%  -119Ki    TOTAL

[pr-commenter]

Regression Detector (Agent Data Plane)

Run ID: 254b15d2-e273-44d7-a90f-633ae825c9eb
Baseline: c07a4461 · Comparison: 1abf6986 · diff

Optimization Goals: ✅ No significant changes detected

Fine details of change detection per experiment (5)

Experiments configured erratic: true are tagged (ignored) and skipped when determining which experiments regressed or improved. Experiments which are detected as erratic at runtime are tagged (erratic) to flag that the run's sample dispersion was high, but their regression / improvement signal still counts.

experiment	goal	Δ mean %	links
quality_gates_rss_dsd_ultraheavy	memory	⚪ -0.35	metrics profiles logs
quality_gates_rss_dsd_low	memory	⚪ -0.40	metrics profiles logs
quality_gates_rss_dsd_medium	memory	⚪ -0.49	metrics profiles logs
quality_gates_rss_idle	memory	⚪ -0.50	metrics profiles logs
quality_gates_rss_dsd_heavy	memory	⚪ -0.87	metrics profiles logs

Bounds Checks: ✅ Passed (5)

experiment	check	replicates	observed	links
quality_gates_rss_dsd_heavy	memory_usage	10/10	✅ 227 MiB ≤ 250 MiB	metrics profiles logs
quality_gates_rss_dsd_low	memory_usage	10/10	✅ 50.9 MiB ≤ 60 MiB	metrics profiles logs
quality_gates_rss_dsd_medium	memory_usage	10/10	✅ 92.7 MiB ≤ 100 MiB	metrics profiles logs
quality_gates_rss_dsd_ultraheavy	memory_usage	10/10	✅ 383 MiB ≤ 420 MiB	metrics profiles logs
quality_gates_rss_idle	memory_usage	10/10	✅ 31.9 MiB ≤ 40 MiB	metrics profiles logs

Explanation

A change is flagged as a regression when |Δ mean %| > 5.00% in the regressing direction for its optimization goal AND SMP marks the experiment as a regression (is_regression: true). Improvements use the matching criteria for the improving direction. Experiments configured erratic: true (tagged (ignored)) are skipped outright; experiments detected as erratic at runtime (tagged (erratic)) still count, since that flag describes sample dispersion rather than directional certainty. The Δ mean % cell is colored accordingly: 🟢 = improvement, 🔴 = regression, ⚪ = neutral. Reduction in CPU or memory is an improvement; reduction in ingress throughput is a regression.

[datadog-datadog-prod-us1-2]

More details

The typed migration preserves the effective APM stats environment, shared flush timeout, zero-timeout 10 ms floor, and MessagePack metadata path; no diff-only behavioral regression was identified. The focused Rust tests and checks could not execute because the sandbox cannot fetch the uncached hyper-http-proxy git dependency.

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[datadog-datadog-prod-us1-2]

More details

The typed cutover preserves peer-tag controls, fallback environments, hostname enrichment, and encoder flush timing through the existing source-to-model paths. Local behavioral execution was blocked by unavailable pinned Rust and Git dependencies, so confidence rests on direct parity inspection.

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