[CWS] sysctl_snapshot event

[Gui774ume]

What does this PR do?

This PR introduces the sysctl_snapshot event which snapshots periodically the system control parameters in /proc/sys (and the few security relevant ones in /sys/kernel/security) and send the output to Datadog.

2 new parameters were added in order to control this periodical snapshot:

• runtime_security_config.sysctl_snapshot.enabled: controls if the system control parameter periodical snapshot should be activated:
• runtime_security_config.sysctl_snapshot.period: controls the period at which the sysctl_snapshot events should be sent.

Motivation

This PR introduces the sysctl_snapshot event which completes the requirements for tracking sysctl parameters (along with the sysctl event type introduced in #34482).

Describe how you validated your changes

Enable the feature with the configuration parameter, reduce the period and start the agent.
Wait for the configured duration.
You should see a sysctl_snapshot event sent to Datadog.

[cit-pr-commenter]

Go Package Import Differences

Baseline: a0caaff
Comparison: ef84786

binary	os	arch	change
system-probe	linux	amd64	+1, -0 +github.com/DataDog/datadog-agent/pkg/security/probe/sysctl
system-probe	linux	arm64	+1, -0 +github.com/DataDog/datadog-agent/pkg/security/probe/sysctl

[agent-platform-auto-pr]

Uncompressed package size comparison

Comparison with ancestor a0caaff7a0923a05ea732bc07c9c14dd99c9a1e1

Diff per package

package	diff	status	size	ancestor	threshold
datadog-agent-aarch64-rpm	0.25MB	⚠️	816.24MB	815.99MB	0.50MB
datadog-agent-arm64-deb	0.25MB	⚠️	806.47MB	806.21MB	0.50MB
datadog-agent-amd64-deb	0.25MB	⚠️	815.50MB	815.25MB	0.50MB
datadog-agent-x86_64-rpm	0.25MB	⚠️	825.30MB	825.05MB	0.50MB
datadog-agent-x86_64-suse	0.25MB	⚠️	825.30MB	825.05MB	0.50MB
datadog-dogstatsd-arm64-deb	0.00MB	✅	37.97MB	37.96MB	0.50MB
datadog-dogstatsd-amd64-deb	0.00MB	✅	39.42MB	39.42MB	0.50MB
datadog-dogstatsd-x86_64-rpm	0.00MB	✅	39.50MB	39.50MB	0.50MB
datadog-dogstatsd-x86_64-suse	0.00MB	✅	39.50MB	39.50MB	0.50MB
datadog-heroku-agent-amd64-deb	0.00MB	✅	440.67MB	440.67MB	0.50MB
datadog-iot-agent-amd64-deb	0.00MB	✅	62.10MB	62.10MB	0.50MB
datadog-iot-agent-x86_64-rpm	0.00MB	✅	62.17MB	62.17MB	0.50MB
datadog-iot-agent-x86_64-suse	0.00MB	✅	62.17MB	62.17MB	0.50MB
datadog-iot-agent-arm64-deb	0.00MB	✅	59.34MB	59.34MB	0.50MB
datadog-iot-agent-aarch64-rpm	0.00MB	✅	59.41MB	59.41MB	0.50MB

Decision

⚠️ Warning

[cit-pr-commenter]

Regression Detector

Regression Detector Results

Metrics dashboard
Target profiles
Run ID: 802b0433-b03d-4a1b-a6bf-82ce89226f55

Baseline: a0caaff
Comparison: ef84786
Diff

Optimization Goals: ✅ No significant changes detected

Fine details of change detection per experiment

perf	experiment	goal	Δ mean %	Δ mean % CI	trials	links
➖	quality_gate_logs	% cpu utilization	+1.07	[-1.85, +4.00]	1	Logs
➖	file_tree	memory utilization	+0.36	[+0.31, +0.42]	1	Logs
➖	quality_gate_idle	memory utilization	+0.14	[+0.08, +0.20]	1	Logs bounds checks dashboard
➖	file_to_blackhole_1000ms_latency_linear_load	egress throughput	+0.14	[-0.33, +0.61]	1	Logs
➖	file_to_blackhole_100ms_latency	egress throughput	+0.05	[-0.63, +0.73]	1	Logs
➖	file_to_blackhole_0ms_latency_http2	egress throughput	+0.02	[-0.78, +0.82]	1	Logs
➖	file_to_blackhole_0ms_latency	egress throughput	+0.01	[-0.83, +0.85]	1	Logs
➖	uds_dogstatsd_to_api	ingress throughput	+0.00	[-0.27, +0.28]	1	Logs
➖	tcp_dd_logs_filter_exclude	ingress throughput	-0.00	[-0.02, +0.02]	1	Logs
➖	file_to_blackhole_0ms_latency_http1	egress throughput	-0.01	[-0.84, +0.83]	1	Logs
➖	uds_dogstatsd_to_api_cpu	% cpu utilization	-0.01	[-0.90, +0.88]	1	Logs
➖	file_to_blackhole_300ms_latency	egress throughput	-0.01	[-0.63, +0.61]	1	Logs
➖	quality_gate_idle_all_features	memory utilization	-0.02	[-0.07, +0.03]	1	Logs bounds checks dashboard
➖	file_to_blackhole_500ms_latency	egress throughput	-0.10	[-0.89, +0.69]	1	Logs
➖	file_to_blackhole_1000ms_latency	egress throughput	-0.16	[-0.93, +0.62]	1	Logs
➖	tcp_syslog_to_blackhole	ingress throughput	-0.19	[-0.24, -0.13]	1	Logs

Bounds Checks: ✅ Passed

perf	experiment	bounds_check_name	replicates_passed	links
✅	file_to_blackhole_0ms_latency	lost_bytes	10/10
✅	file_to_blackhole_0ms_latency	memory_usage	10/10
✅	file_to_blackhole_0ms_latency_http1	lost_bytes	10/10
✅	file_to_blackhole_0ms_latency_http1	memory_usage	10/10
✅	file_to_blackhole_0ms_latency_http2	lost_bytes	10/10
✅	file_to_blackhole_0ms_latency_http2	memory_usage	10/10
✅	file_to_blackhole_1000ms_latency	memory_usage	10/10
✅	file_to_blackhole_1000ms_latency_linear_load	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_300ms_latency	lost_bytes	10/10
✅	file_to_blackhole_300ms_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
✅	quality_gate_logs	lost_bytes	10/10
✅	quality_gate_logs	memory_usage	10/10

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_logs, bounds check intake_connections: 10/10 replicas passed. Gate passed.
• quality_gate_logs, bounds check memory_usage: 10/10 replicas passed. Gate passed.
• quality_gate_logs, bounds check lost_bytes: 10/10 replicas passed. Gate passed.

[agent-platform-auto-pr]

Test changes on VM

Use this command from test-infra-definitions to manually test this PR changes on a VM:

inv aws.create-vm --pipeline-id=57466650 --os-family=ubuntu

Note: This applies to commit ef84786

[agent-platform-auto-pr]

Static quality checks ✅

Please find below the results from static quality gates

Successful checks

Info

Result	Quality gate	On disk size	On disk size limit	On wire size	On wire size limit
✅	static_quality_gate_agent_deb_amd64	789.09MiB	801.8MiB	192.34MiB	202.62MiB
✅	static_quality_gate_agent_deb_arm64	780.57MiB	793.14MiB	174.94MiB	184.51MiB
✅	static_quality_gate_agent_rpm_amd64	789.11MiB	801.79MiB	194.34MiB	205.03MiB
✅	static_quality_gate_agent_rpm_arm64	780.42MiB	793.09MiB	175.9MiB	186.44MiB
✅	static_quality_gate_agent_suse_amd64	789.1MiB	801.81MiB	194.34MiB	205.03MiB
✅	static_quality_gate_agent_suse_arm64	780.59MiB	793.14MiB	175.9MiB	186.44MiB
✅	static_quality_gate_dogstatsd_deb_amd64	37.67MiB	47.67MiB	9.78MiB	19.78MiB
✅	static_quality_gate_dogstatsd_deb_arm64	36.28MiB	46.27MiB	8.49MiB	18.49MiB
✅	static_quality_gate_dogstatsd_rpm_amd64	37.67MiB	47.67MiB	9.79MiB	19.79MiB
✅	static_quality_gate_dogstatsd_suse_amd64	37.67MiB	47.67MiB	9.79MiB	19.79MiB
✅	static_quality_gate_iot_agent_deb_amd64	59.3MiB	69.0MiB	14.9MiB	24.8MiB
✅	static_quality_gate_iot_agent_deb_arm64	56.66MiB	66.4MiB	12.83MiB	22.8MiB
✅	static_quality_gate_iot_agent_rpm_amd64	59.3MiB	69.0MiB	14.92MiB	24.8MiB
✅	static_quality_gate_iot_agent_rpm_arm64	56.66MiB	66.4MiB	12.86MiB	22.8MiB
✅	static_quality_gate_iot_agent_suse_amd64	59.3MiB	69.0MiB	14.92MiB	24.8MiB
✅	static_quality_gate_docker_agent_amd64	873.87MiB	886.12MiB	293.92MiB	304.21MiB
✅	static_quality_gate_docker_agent_arm64	888.52MiB	900.79MiB	280.18MiB	290.47MiB
✅	static_quality_gate_docker_agent_jmx_amd64	1.05GiB	1.06GiB	369.02MiB	379.33MiB
✅	static_quality_gate_docker_agent_jmx_arm64	1.05GiB	1.06GiB	351.26MiB	361.55MiB
✅	static_quality_gate_docker_dogstatsd_amd64	45.82MiB	55.78MiB	17.28MiB	27.28MiB
✅	static_quality_gate_docker_dogstatsd_arm64	44.46MiB	54.45MiB	16.16MiB	26.16MiB
✅	static_quality_gate_docker_cluster_agent_amd64	265.0MiB	274.78MiB	106.36MiB	116.28MiB
✅	static_quality_gate_docker_cluster_agent_arm64	280.96MiB	290.82MiB	101.18MiB	111.12MiB