[AGENTRUN-784] feat: Rust-based shared library checks core with an example check

[Enzu83]

What does this PR do?

This PR adds the core part of Rust-based checks and an example of a Rust-based shared library check.

The core part acts as the glue code between the check implementation in Rust and the Agent (Running the check, passing configuration, sending metrics...). Each check includes the core part in their implementation.

Motivation

Provide the source code for shared library checks used by the shared library loader implemented in:

• [AGENTRUN-866] Add ability to run Rust-based checks through shared libraries #39676

Describe how you validated your changes

• Compile the example check (package example) and have it loaded, scheduled and run by the Agent.
• Verify that the metrics, service checks and events are correctly sent to the backend.
  They are defined in pkg/collector/sharedlibrary/rustchecks/checks/example/src/check.rs

Additional Notes

This code isn't used in the build or in any jobs, it's put here to experiment with Rust-based shared library checks.

[agent-platform-auto-pr]

Static quality checks

✅ Please find below the results from static quality gates
Comparison made with ancestor ed28000
📊 Static Quality Gates Dashboard
🔗 SQG Job

31 successful checks with minimal change (< 2 KiB)

	Quality gate	Current Size
✅	agent_deb_amd64	745.227 MiB
✅	agent_deb_amd64_fips	703.579 MiB
✅	agent_heroku_amd64	311.555 MiB
✅	agent_msi	609.362 MiB
✅	agent_rpm_amd64	745.211 MiB
✅	agent_rpm_amd64_fips	703.562 MiB
✅	agent_rpm_arm64	723.273 MiB
✅	agent_rpm_arm64_fips	684.614 MiB
✅	agent_suse_amd64	745.211 MiB
✅	agent_suse_amd64_fips	703.562 MiB
✅	agent_suse_arm64	723.273 MiB
✅	agent_suse_arm64_fips	684.614 MiB
✅	docker_agent_amd64	805.557 MiB
✅	docker_agent_arm64	808.417 MiB
✅	docker_agent_jmx_amd64	996.473 MiB
✅	docker_agent_jmx_arm64	988.111 MiB
✅	docker_cluster_agent_amd64	203.566 MiB
✅	docker_cluster_agent_arm64	217.975 MiB
✅	docker_cws_instrumentation_amd64	7.135 MiB
✅	docker_cws_instrumentation_arm64	6.689 MiB
✅	docker_dogstatsd_amd64	38.611 MiB
✅	docker_dogstatsd_arm64	36.938 MiB
✅	dogstatsd_deb_amd64	29.835 MiB
✅	dogstatsd_deb_arm64	27.988 MiB
✅	dogstatsd_rpm_amd64	29.835 MiB
✅	dogstatsd_suse_amd64	29.835 MiB
✅	iot_agent_deb_amd64	43.041 MiB
✅	iot_agent_deb_arm64	40.103 MiB
✅	iot_agent_deb_armhf	40.843 MiB
✅	iot_agent_rpm_amd64	43.041 MiB
✅	iot_agent_suse_amd64	43.041 MiB

On-wire sizes (compressed)

	Quality gate	Change	Size (prev → curr → max)
✅	agent_deb_amd64	-41.21 KiB (0.02% reduction)	173.969 → 173.928 → 177.700
✅	agent_deb_amd64_fips	-8.31 KiB (0.00% reduction)	164.834 → 164.826 → 172.230
✅	agent_heroku_amd64	-3.5 KiB (0.00% reduction)	75.126 → 75.123 → 79.970
✅	agent_msi	+12.0 KiB (0.01% increase)	137.918 → 137.930 → 146.220
✅	agent_rpm_amd64	+21.88 KiB (0.01% increase)	175.912 → 175.934 → 180.780
✅	agent_rpm_amd64_fips	-10.97 KiB (0.01% reduction)	167.780 → 167.769 → 173.370
✅	agent_rpm_arm64	-41.98 KiB (0.03% reduction)	158.321 → 158.280 → 161.610
✅	agent_rpm_arm64_fips	-32.71 KiB (0.02% reduction)	151.126 → 151.094 → 155.910
✅	agent_suse_amd64	+21.88 KiB (0.01% increase)	175.912 → 175.934 → 180.780
✅	agent_suse_amd64_fips	-10.97 KiB (0.01% reduction)	167.780 → 167.769 → 173.370
✅	agent_suse_arm64	-41.98 KiB (0.03% reduction)	158.321 → 158.280 → 161.610
✅	agent_suse_arm64_fips	-32.71 KiB (0.02% reduction)	151.126 → 151.094 → 155.910
✅	docker_agent_amd64	neutral	266.500 MiB → 271.240
✅	docker_agent_arm64	neutral	253.768 MiB → 259.800
✅	docker_agent_jmx_amd64	neutral	335.143 MiB → 339.870
✅	docker_agent_jmx_arm64	-4.44 KiB (0.00% reduction)	318.411 → 318.407 → 324.390
✅	docker_cluster_agent_amd64	neutral	71.249 MiB → 71.920
✅	docker_cluster_agent_arm64	neutral	66.890 MiB → 67.220
✅	docker_cws_instrumentation_amd64	neutral	2.995 MiB → 3.330
✅	docker_cws_instrumentation_arm64	neutral	2.727 MiB → 3.090
✅	docker_dogstatsd_amd64	neutral	14.943 MiB → 15.820
✅	docker_dogstatsd_arm64	neutral	14.272 MiB → 14.830
✅	dogstatsd_deb_amd64	neutral	7.884 MiB → 8.790
✅	dogstatsd_deb_arm64	neutral	6.767 MiB → 7.710
✅	dogstatsd_rpm_amd64	neutral	7.894 MiB → 8.800
✅	dogstatsd_suse_amd64	neutral	7.894 MiB → 8.800
✅	iot_agent_deb_amd64	neutral	11.353 MiB → 12.040
✅	iot_agent_deb_arm64	neutral	9.663 MiB → 10.450
✅	iot_agent_deb_armhf	neutral	9.893 MiB → 10.620
✅	iot_agent_rpm_amd64	neutral	11.371 MiB → 12.060
✅	iot_agent_suse_amd64	neutral	11.371 MiB → 12.060

[cit-pr-commenter-54b7da]

Regression Detector

Regression Detector Results

Metrics dashboard
Target profiles
Run ID: cced9e9c-f5c8-481a-aced-1355b4397524

Baseline: 38280a8
Comparison: d58e743
Diff

Optimization Goals: ✅ No significant changes detected

Experiments ignored for regressions

Regressions in experiments with settings containing erratic: true are ignored.

perf	experiment	goal	Δ mean %	Δ mean % CI	trials	links
➖	docker_containers_cpu	% cpu utilization	-2.45	[-5.50, +0.59]	1	Logs

Fine details of change detection per experiment

perf	experiment	goal	Δ mean %	Δ mean % CI	trials	links
➖	otlp_ingest_metrics	memory utilization	+0.40	[+0.24, +0.55]	1	Logs
➖	ddot_metrics_sum_delta	memory utilization	+0.16	[+0.00, +0.33]	1	Logs
➖	quality_gate_metrics_logs	memory utilization	+0.13	[-0.09, +0.35]	1	Logs bounds checks dashboard
➖	file_to_blackhole_100ms_latency	egress throughput	+0.05	[+0.01, +0.10]	1	Logs
➖	file_to_blackhole_1000ms_latency	egress throughput	+0.04	[-0.37, +0.46]	1	Logs
➖	file_to_blackhole_0ms_latency	egress throughput	+0.01	[-0.47, +0.49]	1	Logs
➖	uds_dogstatsd_to_api	ingress throughput	+0.00	[-0.13, +0.13]	1	Logs
➖	file_to_blackhole_500ms_latency	egress throughput	-0.00	[-0.39, +0.38]	1	Logs
➖	tcp_dd_logs_filter_exclude	ingress throughput	-0.01	[-0.09, +0.08]	1	Logs
➖	uds_dogstatsd_to_api_v3	ingress throughput	-0.01	[-0.14, +0.11]	1	Logs
➖	quality_gate_idle	memory utilization	-0.03	[-0.07, +0.01]	1	Logs bounds checks dashboard
➖	quality_gate_idle_all_features	memory utilization	-0.03	[-0.07, +0.01]	1	Logs bounds checks dashboard
➖	uds_dogstatsd_20mb_12k_contexts_20_senders	memory utilization	-0.07	[-0.12, -0.01]	1	Logs
➖	ddot_metrics_sum_cumulative	memory utilization	-0.15	[-0.29, -0.00]	1	Logs
➖	file_tree	memory utilization	-0.27	[-0.32, -0.22]	1	Logs
➖	ddot_logs	memory utilization	-0.36	[-0.43, -0.29]	1	Logs
➖	otlp_ingest_logs	memory utilization	-0.42	[-0.52, -0.32]	1	Logs
➖	tcp_syslog_to_blackhole	ingress throughput	-0.43	[-0.50, -0.36]	1	Logs
➖	ddot_metrics_sum_cumulativetodelta_exporter	memory utilization	-0.45	[-0.67, -0.23]	1	Logs
➖	ddot_metrics	memory utilization	-0.50	[-0.67, -0.33]	1	Logs
➖	quality_gate_logs	% cpu utilization	-0.71	[-2.17, +0.75]	1	Logs bounds checks dashboard
➖	docker_containers_memory	memory utilization	-0.71	[-0.78, -0.65]	1	Logs
➖	docker_containers_cpu	% cpu utilization	-2.45	[-5.50, +0.59]	1	Logs

Bounds Checks: ✅ Passed

perf	experiment	bounds_check_name	replicates_passed	links
✅	docker_containers_cpu	simple_check_run	10/10
✅	docker_containers_memory	memory_usage	10/10
✅	docker_containers_memory	simple_check_run	10/10
✅	file_to_blackhole_0ms_latency	lost_bytes	10/10
✅	file_to_blackhole_0ms_latency	memory_usage	10/10
✅	file_to_blackhole_1000ms_latency	lost_bytes	10/10
✅	file_to_blackhole_1000ms_latency	memory_usage	10/10
✅	file_to_blackhole_100ms_latency	lost_bytes	10/10
✅	file_to_blackhole_100ms_latency	memory_usage	10/10
✅	file_to_blackhole_500ms_latency	lost_bytes	10/10
✅	file_to_blackhole_500ms_latency	memory_usage	10/10
✅	quality_gate_idle	intake_connections	10/10	bounds checks dashboard
✅	quality_gate_idle	memory_usage	10/10	bounds checks dashboard
✅	quality_gate_idle_all_features	intake_connections	10/10	bounds checks dashboard
✅	quality_gate_idle_all_features	memory_usage	10/10	bounds checks dashboard
✅	quality_gate_logs	intake_connections	10/10	bounds checks dashboard
✅	quality_gate_logs	lost_bytes	10/10	bounds checks dashboard
✅	quality_gate_logs	memory_usage	10/10	bounds checks dashboard
✅	quality_gate_metrics_logs	cpu_usage	10/10	bounds checks dashboard
✅	quality_gate_metrics_logs	intake_connections	10/10	bounds checks dashboard
✅	quality_gate_metrics_logs	lost_bytes	10/10	bounds checks dashboard
✅	quality_gate_metrics_logs	memory_usage	10/10	bounds checks dashboard

Explanation

Confidence level: 90.00%
Effect size tolerance: |Δ mean %| ≥ 5.00%

Performance changes are noted in the perf column of each table:

• ✅ = significantly better comparison variant performance
• ❌ = significantly worse comparison variant performance
• ➖ = no significant change in performance

A regression test is an A/B test of target performance in a repeatable rig, where "performance" is measured as "comparison variant minus baseline variant" for an optimization goal (e.g., ingress throughput). Due to intrinsic variability in measuring that goal, we can only estimate its mean value for each experiment; we report uncertainty in that value as a 90.00% confidence interval denoted "Δ mean % CI".

For each experiment, we decide whether a change in performance is a "regression" -- a change worth investigating further -- if all of the following criteria are true:

1. Its estimated |Δ mean %| ≥ 5.00%, indicating the change is big enough to merit a closer look.

2. Its 90.00% confidence interval "Δ mean % CI" does not contain zero, indicating that if our statistical model is accurate, there is at least a 90.00% chance there is a difference in performance between baseline and comparison variants.

3. Its configuration does not mark it "erratic".

CI Pass/Fail Decision

✅ Passed. All Quality Gates passed.

• quality_gate_idle_all_features, bounds check memory_usage: 10/10 replicas passed. Gate passed.
• quality_gate_idle_all_features, bounds check intake_connections: 10/10 replicas passed. Gate passed.
• quality_gate_idle, bounds check intake_connections: 10/10 replicas passed. Gate passed.
• quality_gate_idle, bounds check memory_usage: 10/10 replicas passed. Gate passed.
• quality_gate_metrics_logs, bounds check cpu_usage: 10/10 replicas passed. Gate passed.
• quality_gate_metrics_logs, bounds check intake_connections: 10/10 replicas passed. Gate passed.
• quality_gate_metrics_logs, bounds check memory_usage: 10/10 replicas passed. Gate passed.
• quality_gate_metrics_logs, bounds check lost_bytes: 10/10 replicas passed. Gate passed.
• quality_gate_logs, bounds check lost_bytes: 10/10 replicas passed. Gate passed.
• quality_gate_logs, bounds check intake_connections: 10/10 replicas passed. Gate passed.
• quality_gate_logs, bounds check memory_usage: 10/10 replicas passed. Gate passed.

[dd-octo-sts]

This pull request has been automatically marked as stale because it has not had activity in the past 15 days.

It will be closed in 30 days if no further activity occurs. If this pull request is still relevant, adding a comment or pushing new commits will keep it open. Also, you can always reopen the pull request if you missed the window.

Thank you for your contributions!

[agent-platform-auto-pr]

Files inventory check summary

File checks results against ancestor ed280008:

Results for datadog-agent_7.78.0~devel.git.354.bd3a0ce.pipeline.100854018-1_amd64.deb:

No change detected

[chatgpt-codex-connector]

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[fabbing]

Approved as a preview method to have Rust checks, but the interfaces will change to make the checks compatible with the Slim check interface and compatibility with ADP/ACR.