chore(antithesis): Antithesis test harness and workload

[blt]

Summary

Adds an Antithesis test harness for agent-data-plane under test/antithesis/. It brings ADP up in a minimal, runnable topology and gives Antithesis a workload to drive. Right now I've mostly yanked things from millstone. I will expand on this in follow-on PRs.

The new antithesis feature and SDK are not enabled by default, so production builds are unchanged.

Change Type

• Bug fix
• New feature
• Non-functional (chore, refactoring, docs)
• Performance

How did you test this PR?

I fired off a job to our antithesis tenant cluster.

References

N/A

[blt]

• docs(agent-data-plane): Antithesis research scratchbook and bug ledger #1768 : 2 dependent PRs (#1769 , #1779 )
• chore(antithesis): Antithesis test harness and workload #1767 👈 (View in Graphite)
• enhancement(correctness): Create test/antithesis sub-project  #1774
• main

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[datadog-datadog-prod-us1-2]

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[pr-commenter]

Binary Size Analysis (Agent Data Plane)

Baseline: 1bd1613 · Comparison: 476a5b6 · diff
Analysis Configuration: stripped binaries · Pass/Fail Threshold: +5%
Sizes: 37.89 MiB (baseline) vs 37.89 MiB (comparison)
Size Change: -328 B (-0.00%)

✅ Binary size difference within threshold

Changes by Module

Module	File Size	Symbols
anon.36eead261da73468b10600f578de22ed.87.llvm.14046994766694184360	+2.83 KiB	1
anon.0acc57ca412442189c7678857beeb25f.1.llvm.18230564023335910389	-2.83 KiB	1
anon.eba192a60e6caa742f85cd2f7b63cef6.18.llvm.10590908203511297131	-2.46 KiB	1
anon.e5f0d67f8d0d8b1c6e3888577e274890.511.llvm.6538778123177323897	+2.46 KiB	1
anon.423de405463045f5e6382613e58502c9.555.llvm.7227059468892596563	+1.59 KiB	1
anon.ed85dad8c2fdcfe5c906411ebc1601c6.1.llvm.11441704272744907195	-1.59 KiB	1
anon.83861495afd7ed2d7a5f7a2024dbca33.32.llvm.16744458082958744374	+1.06 KiB	1
anon.423de405463045f5e6382613e58502c9.623.llvm.2135413985037036474	-1.06 KiB	1
anon.0cbe5d1da6c19cbc1bc3d4c0ab437541.44.llvm.197401638548642842	+822 B	1
anon.f002492f45681213d5f2178507d8f8df.914.llvm.4043333310207047691	-821 B	1
anon.d7ee623b5fafe6b057a7a0c622afa7bc.39.llvm.10556945865972081602	+652 B	1
anon.4b222af43742daee88c77b7e3b58dba9.488.llvm.10432521140313545618	-652 B	1
anon.6af111390f9ec0d8aca610283c4bc8fb.148.llvm.12481652543943855889	-652 B	1
anon.6af111390f9ec0d8aca610283c4bc8fb.148.llvm.7772407472488747350	+651 B	1
anon.281a90e99c1fd604a433b96c14d92f5a.302.llvm.7830088799502066918	+629 B	1
anon.4b222af43742daee88c77b7e3b58dba9.367.llvm.10432521140313545618	-629 B	1
_RNvXsZ_NtNtCs7BliBxkEZsN_4core3fmt3numjNtB7_5Debug3fmt.llvm.17068787117399038695	+579 B	1
_RNvXsX_NtNtCs7BliBxkEZsN_4core3fmt3numyNtB7_5Debug3fmt.llvm.12447776353896946495	-579 B	1
_RNvXsZ_NtNtCs7BliBxkEZsN_4core3fmt3numjNtB7_5Debug3fmt.llvm.10432521140313545618	-579 B	1
_RNvXsX_NtNtCs7BliBxkEZsN_4core3fmt3numyNtB7_5Debug3fmt.llvm.4062887792818234319	+578 B	1

Detailed Symbol Changes

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  [NEW] +3.43Ki  [NEW]    +456    core::ptr::drop_in_place<core::iter::adapters::map::Map<std::collections::hash::map::IntoIter<axum::routing::RouteId,axum::routing::Endpoint<saluki_components::destinations::dsd_stats::DogStatsDAPIHandlerState>>,axum::routing::path_router::PathRouter<saluki_components::destinations::dsd_stats::DogStatsDAPIHandlerState,_>::with_state<$LP$$RP$>::{{closure}}>>::h5a147bb683008716
  [NEW] +2.84Ki  [NEW]     +47    _<http_body_util::combinators::map_err::MapErr<B,F> as http_body::Body>::size_hint::h674725303a3ab093
  [NEW] +2.83Ki  [NEW]      +2    anon.36eead261da73468b10600f578de22ed.87.llvm.14046994766694184360
  [NEW] +2.46Ki  [NEW]     +80    anon.e5f0d67f8d0d8b1c6e3888577e274890.511.llvm.6538778123177323897
  [NEW] +1.59Ki  [NEW]     +97    anon.423de405463045f5e6382613e58502c9.555.llvm.7227059468892596563
  [NEW] +1.57Ki  [NEW]    +703    _<http_body_util::combinators::map_err::MapErr<B,F> as http_body::Body>::poll_frame::hb2bbfae5f62c1b09
  [NEW] +1.38Ki  [NEW]    +691    _<http_body_util::combinators::map_err::MapErr<B,F> as http_body::Body>::poll_frame::h147ce3747417d704
  [NEW] +1.29Ki  [NEW]    +315    core::ptr::drop_in_place<tokio::sync::mpsc::bounded::Permit<saluki_core::topology::interconnect::event_buffer::FixedSizeEventBuffer<1024_usize>>>::ha0685aee77bc2b0c
  +266% +1.28Ki  +100%    +168    core::ptr::drop_in_place<alloc::boxed::convert::<impl core::convert::From<alloc::string::String> for alloc::boxed::Box<dyn core::error::Error+core::marker::Send+core::marker::Sync>>::from::StringError>::h2efcd91a58f342f0
  [NEW] +1.27Ki  [NEW]     +33    core::ptr::drop_in_place<http_body_util::combinators::map_err::MapErr<tonic::codec::encode::EncodeBody<tonic_prost::codec::ProstEncoder<datadog_protos::agent_include::datadog::model::v1::HostTagRequest>,tokio_stream::stream_ext::map::Map<tokio_stream::once::Once<datadog_protos::agent_include::datadog::model::v1::HostTagRequest>,core::result::Result<datadog_protos::agent_include::datadog::model::v1::HostTagRequest,tonic::status::Status>::Ok>>,tonic::status::Status::map_error<tonic::status::Status>>>::h12a2caa920ba5408
  -0.1%    -325  [ = ]       0    [1566 Others]
  [DEL] -1.27Ki  [DEL]     -33    core::ptr::drop_in_place<http_body_util::combinators::map_err::MapErr<tonic::codec::encode::EncodeBody<tonic_prost::codec::ProstEncoder<datadog_protos::agent_include::datadog::model::v1::HostnameRequest>,tokio_stream::stream_ext::map::Map<tokio_stream::once::Once<datadog_protos::agent_include::datadog::model::v1::HostnameRequest>,core::result::Result<datadog_protos::agent_include::datadog::model::v1::HostnameRequest,tonic::status::Status>::Ok>>,tonic::status::Status::map_error<tonic::status::Status>>>::h7d0bcb55600c1599
 -40.4% -1.28Ki -14.3%    -168    core::ptr::drop_in_place<alloc::string::String>::hf4631bd4382d6119
  [DEL] -1.29Ki  [DEL]    -315    core::ptr::drop_in_place<tokio::sync::mpsc::bounded::Permit<saluki_env::workload::metadata::MetadataOperation>>::h2e1e385cf4a89858
  [DEL] -1.38Ki  [DEL]    -691    _<http_body_util::combinators::map_err::MapErr<B,F> as http_body::Body>::poll_frame::h8d3d490742ef5359
  [DEL] -1.57Ki  [DEL]    -703    _<http_body_util::combinators::map_err::MapErr<B,F> as http_body::Body>::poll_frame::h4c56918971715b8b
  [DEL] -1.59Ki  [DEL]     -97    anon.ed85dad8c2fdcfe5c906411ebc1601c6.1.llvm.11441704272744907195
  [DEL] -2.46Ki  [DEL]     -80    anon.eba192a60e6caa742f85cd2f7b63cef6.18.llvm.10590908203511297131
  [DEL] -2.83Ki  [DEL]      -2    anon.0acc57ca412442189c7678857beeb25f.1.llvm.18230564023335910389
  [DEL] -2.84Ki  [DEL]     -47    _<http_body_util::combinators::map_err::MapErr<B,F> as http_body::Body>::size_hint::h66dcc7212f74260d
  [DEL] -3.44Ki  [DEL]    -456    core::ptr::drop_in_place<core::iter::adapters::map::Map<std::collections::hash::map::IntoIter<axum::routing::RouteId,axum::routing::Endpoint<saluki_components::sources::dogstatsd::replay::replay_control::DogStatsDReplayControl>>,axum::routing::path_router::PathRouter<saluki_components::sources::dogstatsd::replay::replay_control::DogStatsDReplayControl,_>::with_state<$LP$$RP$>::{{closure}}>>::h9e288300660bcc12
  -0.0%    -328  [ = ]       0    TOTAL

[pr-commenter]

Regression Detector (Agent Data Plane)

Run ID: 0612d7ab-1abc-436f-981d-dfc1e6403cbe
Baseline: 1bd16137 · Comparison: 476a5b66 · diff

Optimization Goals: ✅ No significant changes detected

Fine details of change detection per experiment (35)

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
otlp_ingest_traces_5mb_cpu (erratic)	cpu	⚪ +2.61	metrics profiles logs
otlp_ingest_metrics_5mb_memory	memory	⚪ +1.82	metrics profiles logs
dsd_uds_500mb_3k_contexts_cpu (erratic)	cpu	⚪ +1.07	metrics profiles logs
dsd_uds_500mb_3k_contexts_throughput	throughput	⚪ -1.00	metrics profiles logs
otlp_ingest_traces_ottl_transform_5mb_cpu (erratic)	cpu	⚪ +0.46	metrics profiles logs
dsd_uds_500mb_3k_contexts_memory	memory	⚪ +0.40	metrics profiles logs
otlp_ingest_traces_5mb_memory	memory	⚪ +0.19	metrics profiles logs
otlp_ingest_traces_ottl_transform_5mb_throughput	throughput	⚪ -0.11	metrics profiles logs
quality_gates_rss_dsd_medium	memory	⚪ +0.11	metrics profiles logs
quality_gates_rss_dsd_ultraheavy	memory	⚪ +0.10	metrics profiles logs
quality_gates_rss_dsd_low	memory	⚪ +0.10	metrics profiles logs
otlp_ingest_traces_ottl_transform_5mb_memory	memory	⚪ +0.09	metrics profiles logs
quality_gates_rss_idle	memory	⚪ +0.08	metrics profiles logs
dsd_uds_1mb_3k_contexts_cpu (erratic)	cpu	⚪ +0.07	metrics profiles logs
otlp_ingest_traces_5mb_throughput	throughput	⚪ -0.04	metrics profiles logs
otlp_ingest_logs_5mb_throughput (ignored)	throughput	⚪ -0.02	metrics profiles logs
dsd_uds_1mb_3k_contexts_throughput	throughput	⚪ +0.00	metrics profiles logs
dsd_uds_512kb_3k_contexts_throughput	throughput	⚪ +0.00	metrics profiles logs
dsd_uds_100mb_3k_contexts_throughput	throughput	⚪ +0.00	metrics profiles logs
dsd_uds_10mb_3k_contexts_throughput	throughput	⚪ +0.01	metrics profiles logs
otlp_ingest_metrics_5mb_throughput	throughput	⚪ +0.01	metrics profiles logs
dsd_uds_10mb_3k_contexts_memory	memory	⚪ -0.04	metrics profiles logs
dsd_uds_512kb_3k_contexts_memory	memory	⚪ -0.11	metrics profiles logs
otlp_ingest_logs_5mb_cpu (ignored)	cpu	⚪ -0.17	metrics profiles logs
otlp_ingest_traces_ottl_filtering_5mb_memory	memory	⚪ -0.20	metrics profiles logs
dsd_uds_100mb_3k_contexts_cpu (erratic)	cpu	⚪ -0.26	metrics profiles logs
dsd_uds_1mb_3k_contexts_memory	memory	⚪ -0.41	metrics profiles logs
dsd_uds_100mb_3k_contexts_memory	memory	⚪ -0.61	metrics profiles logs
otlp_ingest_traces_ottl_filtering_5mb_throughput	throughput	⚪ +0.71	metrics profiles logs
quality_gates_rss_dsd_heavy	memory	⚪ -0.79	metrics profiles logs
otlp_ingest_traces_ottl_filtering_5mb_cpu (erratic)	cpu	⚪ -2.67	metrics profiles logs
dsd_uds_10mb_3k_contexts_cpu (erratic)	cpu	⚪ -2.93	metrics profiles logs
otlp_ingest_metrics_5mb_cpu (erratic)	cpu	⚪ -3.80	metrics profiles logs
otlp_ingest_logs_5mb_memory (ignored)	memory	⚪ -8.44	metrics profiles logs
dsd_uds_512kb_3k_contexts_cpu (erratic)	cpu	🟢 -12.05	metrics profiles logs

Bounds Checks: ✅ Passed (5)

experiment	check	replicates	observed	links
quality_gates_rss_dsd_heavy	memory_usage	10/10	✅ 124 MiB ≤ 140 MiB	metrics profiles logs
quality_gates_rss_dsd_low	memory_usage	10/10	✅ 39.9 MiB ≤ 50 MiB	metrics profiles logs
quality_gates_rss_dsd_medium	memory_usage	10/10	✅ 60.7 MiB ≤ 75 MiB	metrics profiles logs
quality_gates_rss_dsd_ultraheavy	memory_usage	10/10	✅ 186 MiB ≤ 200 MiB	metrics profiles logs
quality_gates_rss_idle	memory_usage	10/10	✅ 26.6 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.

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