chore(config): migrate APM stats transform to typed config

[webern]

Summary

Migrate the APM Stats transform to the resolved typed traces configuration. The transform now receives typed stats, peer-tag, environment, and hostname inputs, and the legacy APM configuration adapter is 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
• APM Stats tests: 38 passed
• cargo check -p saluki-components -p agent-data-plane --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
• chore(config): migrate APM stats transform to typed config #2265 👈 (View in Graphite)
• 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: 14fb28f · Comparison: 8db85b8 · diff
Analysis Configuration: stripped binaries · Pass/Fail Threshold: +5%
Sizes: 41.39 MiB (baseline) vs 41.39 MiB (comparison)
Size Change: +1.22 KiB (+0.00%)

✅ Binary size difference within threshold

Changes by Module

Module	File Size	Symbols
prost	-45.75 KiB	88
h2	+31.94 KiB	112
hyper	-25.02 KiB	59
otlp_protos::otlp_include::opentelemetry	+22.59 KiB	72
anon.71247e6768bc3ff5210891ad39f5ad3e.573.llvm.16394933846966769920	-17.62 KiB	1
anon.d25442021e55207a1dc52a0783b8a331.602.llvm.11360328729134350799	+17.61 KiB	1
saluki_components::sources::otlp	-16.19 KiB	34
tracing	+15.28 KiB	26
saluki_components::common::datadog	-14.50 KiB	95
serde_core	+13.51 KiB	103
anon.d25442021e55207a1dc52a0783b8a331.713.llvm.11360328729134350799	+12.37 KiB	1
anon.71247e6768bc3ff5210891ad39f5ad3e.686.llvm.16394933846966769920	-12.37 KiB	1
&mut serde_json	-11.55 KiB	34
rmp	+10.59 KiB	16
agent_data_plane_config::_::_<impl serde_core	-10.12 KiB	1
figment	-9.76 KiB	83
anon.d25442021e55207a1dc52a0783b8a331.146.llvm.11360328729134350799	+9.71 KiB	1
anon.71247e6768bc3ff5210891ad39f5ad3e.144.llvm.16394933846966769920	-9.62 KiB	1
anon.d25442021e55207a1dc52a0783b8a331.599.llvm.11360328729134350799	+9.15 KiB	1
anon.71247e6768bc3ff5210891ad39f5ad3e.570.llvm.16394933846966769920	-9.06 KiB	1

Detailed Symbol Changes

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  [NEW] +17.6Ki  [NEW]     +76    anon.d25442021e55207a1dc52a0783b8a331.602.llvm.11360328729134350799
  +141% +16.7Ki  +143% +16.7Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::h8152b7ae42bbdf3b
  +152% +15.0Ki  +155% +15.0Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::ha14640b20f74d1e4
  +124% +14.6Ki  +126% +14.6Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::h620744619ca067ad
  +124% +14.6Ki  +126% +14.6Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::ha466ba9027a7db13
  [NEW] +12.4Ki  [NEW]     +81    anon.d25442021e55207a1dc52a0783b8a331.713.llvm.11360328729134350799
  +123% +12.4Ki  +125% +12.4Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::h70e2afbf0bb450d6
  +127% +12.1Ki  +129% +12.1Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::h1be15f59da19991b
  +163% +11.8Ki  +167% +11.8Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::hf32fb3e80e974af1
  +122% +10.9Ki  +124% +10.9Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::h6abd0fc21cbbc508
  +132% +10.9Ki  +134% +10.9Ki    _<figment::value::de::ConfiguredValueDe<I> as serde_core::de::Deserializer>::deserialize_struct::h2ad11a8a7bba86cd
  [NEW] +10.7Ki  [NEW] +10.6Ki    h2::proto::connection::Connection<T,P,B>::poll::hf55737dd7d0240e8
  [NEW] +10.4Ki  [NEW] +10.3Ki    h2::proto::connection::Connection<T,P,B>::poll::hde2b4edde49019aa
  [NEW] +10.4Ki  [NEW] +10.3Ki    h2::proto::connection::Connection<T,P,B>::poll::h8dffaa99d2c44419
 -93.8% -10.1Ki -95.5% -10.1Ki    agent_data_plane_config::_::_<impl serde_core::ser::Serialize for agent_data_plane_config::SalukiConfiguration>::serialize::ha4890af58c866150
  [DEL] -12.4Ki  [DEL]     -81    anon.71247e6768bc3ff5210891ad39f5ad3e.686.llvm.16394933846966769920
  [DEL] -14.9Ki  [DEL] -14.8Ki    h2::server::Connection<T,B>::poll_closed::h7604ccd75fdaaad4
  [DEL] -14.9Ki  [DEL] -14.8Ki    h2::server::Connection<T,B>::poll_closed::h02c231ef513ced37
  [DEL] -16.0Ki  [DEL] -15.9Ki    h2::server::Connection<T,B>::poll_closed::h019bce247788111f
  [DEL] -17.6Ki  [DEL]     -76    anon.71247e6768bc3ff5210891ad39f5ad3e.573.llvm.16394933846966769920
  -1.0% -93.4Ki  -1.0% -70.8Ki    [10811 Others]
  +0.0% +1.22Ki  +0.1% +23.9Ki    TOTAL

[pr-commenter]

Regression Detector (Agent Data Plane)

Run ID: 98434c58-142b-47ae-857b-2e71e0777a34
Baseline: 14fb28f7 · Comparison: 8db85b8f · 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_idle	memory	⚪ +0.87	metrics profiles logs
quality_gates_rss_dsd_heavy	memory	⚪ +0.79	metrics profiles logs
quality_gates_rss_dsd_medium	memory	⚪ +0.42	metrics profiles logs
quality_gates_rss_dsd_low	memory	⚪ +0.41	metrics profiles logs
quality_gates_rss_dsd_ultraheavy	memory	⚪ -0.40	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	✅ 50.6 MiB ≤ 60 MiB	metrics profiles logs
quality_gates_rss_dsd_medium	memory_usage	10/10	✅ 90.7 MiB ≤ 100 MiB	metrics profiles logs
quality_gates_rss_dsd_ultraheavy	memory_usage	10/10	✅ 384 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-official]

More details

The migration preserves the APM Stats inputs: resolved Datadog defaults keep span-kind computation and peer-tag aggregation enabled, explicit false values propagate, and environment/hostname fallback behavior is equivalent. Runtime execution was unavailable because the sandbox could not fetch the uncached hyper-http-proxy dependency, so confidence is based on the diff and configuration translation paths.

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[lucastemb]

Looks good. Definitely think it's much cleaner now 👍

[datadog-official]

More details

The typed stats path preserves the legacy true defaults, peer-tag and environment values, and environment-provider hostname fallback. The apparent OTTL changes are byte-identical to the base branch and merge cleanly.

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