[Backport 7.76.x] [networks] Remove faulty PID reuse detection logic

[dd-octo-sts]

Backport 3937bbf from #45686.

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What does this PR do?

This PR removes PID reuse detection logic which resulted in way too many false positives. The root cause was, the EVP stream doesn't have the same clock timestamp as procfs data, making PID reuse detection with this method impossible.

Bryce had commented on this originally, noting that the rest of the agent doesn't currently catch this scenario, in retrospect I should have deleted this code back then.

Motivation

Improve resolv.conf detection rate.

Describe how you validated your changes

The buggy code no longer exists. TestDNSWorkload should continue to pass.

[agent-platform-auto-pr]

Static quality checks

✅ Please find below the results from static quality gates
Comparison made with ancestor 0b30861
📊 Static Quality Gates Dashboard

Successful checks

Info

	Quality gate	Change	Size (prev → curr → max)
✅	agent_deb_amd64_fips	-4.0 KiB (0.00% reduction)	702.008 → 702.004 → 704.000
✅	agent_rpm_amd64_fips	-4.0 KiB (0.00% reduction)	701.991 → 701.987 → 703.990
✅	agent_suse_amd64_fips	-4.0 KiB (0.00% reduction)	701.991 → 701.987 → 703.990

28 successful checks with minimal change (< 2 KiB)

	Quality gate	Current Size
✅	agent_deb_amd64	753.343 MiB
✅	agent_heroku_amd64	326.785 MiB
✅	agent_msi	663.083 MiB
✅	agent_rpm_amd64	753.326 MiB
✅	agent_rpm_arm64	732.086 MiB
✅	agent_rpm_arm64_fips	684.078 MiB
✅	agent_suse_amd64	753.326 MiB
✅	agent_suse_arm64	732.086 MiB
✅	agent_suse_arm64_fips	684.078 MiB
✅	docker_agent_amd64	815.450 MiB
✅	docker_agent_arm64	818.797 MiB
✅	docker_agent_jmx_amd64	1006.329 MiB
✅	docker_agent_jmx_arm64	998.395 MiB
✅	docker_cluster_agent_amd64	181.095 MiB
✅	docker_cluster_agent_arm64	196.921 MiB
✅	docker_cws_instrumentation_amd64	7.135 MiB
✅	docker_cws_instrumentation_arm64	6.689 MiB
✅	docker_dogstatsd_amd64	38.859 MiB
✅	docker_dogstatsd_arm64	37.128 MiB
✅	dogstatsd_deb_amd64	30.074 MiB
✅	dogstatsd_deb_arm64	28.219 MiB
✅	dogstatsd_rpm_amd64	30.074 MiB
✅	dogstatsd_suse_amd64	30.074 MiB
✅	iot_agent_deb_amd64	43.033 MiB
✅	iot_agent_deb_arm64	40.135 MiB
✅	iot_agent_deb_armhf	40.705 MiB
✅	iot_agent_rpm_amd64	43.034 MiB
✅	iot_agent_suse_amd64	43.034 MiB

On-wire sizes (compressed)

	Quality gate	Change	Size (prev → curr → max)
✅	agent_deb_amd64	-29.86 KiB (0.02% reduction)	183.977 → 183.947 → 184.810
✅	agent_deb_amd64_fips	+23.46 KiB (0.01% increase)	172.688 → 172.711 → 173.790
✅	agent_heroku_amd64	-3.24 KiB (0.00% reduction)	87.153 → 87.150 → 88.450
✅	agent_msi	-8.0 KiB (0.01% reduction)	143.160 → 143.152 → 143.300
✅	agent_rpm_amd64	-16.57 KiB (0.01% reduction)	186.873 → 186.857 → 188.160
✅	agent_rpm_amd64_fips	-16.42 KiB (0.01% reduction)	175.719 → 175.703 → 176.600
✅	agent_rpm_arm64	+18.23 KiB (0.01% increase)	168.630 → 168.648 → 169.930
✅	agent_rpm_arm64_fips	+19.33 KiB (0.01% increase)	159.197 → 159.216 → 160.550
✅	agent_suse_amd64	-16.57 KiB (0.01% reduction)	186.873 → 186.857 → 188.160
✅	agent_suse_amd64_fips	-16.42 KiB (0.01% reduction)	175.719 → 175.703 → 176.600
✅	agent_suse_arm64	+18.23 KiB (0.01% increase)	168.630 → 168.648 → 169.930
✅	agent_suse_arm64_fips	+19.33 KiB (0.01% increase)	159.197 → 159.216 → 160.550
✅	docker_agent_amd64	-2.72 KiB (0.00% reduction)	276.711 → 276.709 → 277.400
✅	docker_agent_arm64	-2.04 KiB (0.00% reduction)	264.161 → 264.159 → 266.040
✅	docker_agent_jmx_amd64	-2.95 KiB (0.00% reduction)	345.356 → 345.353 → 346.020
✅	docker_agent_jmx_arm64	+4.93 KiB (0.00% increase)	328.779 → 328.784 → 330.660
✅	docker_cluster_agent_amd64	neutral	63.983 MiB → 64.490
✅	docker_cluster_agent_arm64	neutral	60.245 MiB → 61.170
✅	docker_cws_instrumentation_amd64	neutral	2.994 MiB → 3.330
✅	docker_cws_instrumentation_arm64	neutral	2.726 MiB → 3.090
✅	docker_dogstatsd_amd64	neutral	15.037 MiB → 15.820
✅	docker_dogstatsd_arm64	neutral	14.362 MiB → 14.830
✅	dogstatsd_deb_amd64	neutral	7.949 MiB → 8.790
✅	dogstatsd_deb_arm64	neutral	6.829 MiB → 7.710
✅	dogstatsd_rpm_amd64	neutral	7.960 MiB → 8.800
✅	dogstatsd_suse_amd64	neutral	7.960 MiB → 8.800
✅	iot_agent_deb_amd64	neutral	11.293 MiB → 12.040
✅	iot_agent_deb_arm64	neutral	9.654 MiB → 10.450
✅	iot_agent_deb_armhf	neutral	9.850 MiB → 10.620
✅	iot_agent_rpm_amd64	neutral	11.308 MiB → 12.060
✅	iot_agent_suse_amd64	neutral	11.308 MiB → 12.060

[cit-pr-commenter-54b7da]

Regression Detector

Regression Detector Results

Metrics dashboard
Target profiles
Run ID: 8ba1244d-5eed-4635-90c6-eefa045838b9

Baseline: 0b30861
Comparison: d535a2d
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	+1.94	[-1.11, +4.99]	1	Logs

Fine details of change detection per experiment

perf	experiment	goal	Δ mean %	Δ mean % CI	trials	links
➖	docker_containers_cpu	% cpu utilization	+1.94	[-1.11, +4.99]	1	Logs
➖	quality_gate_metrics_logs	memory utilization	+0.42	[+0.20, +0.63]	1	Logs bounds checks dashboard
➖	ddot_metrics	memory utilization	+0.39	[+0.18, +0.59]	1	Logs
➖	ddot_metrics_sum_cumulative	memory utilization	+0.34	[+0.17, +0.50]	1	Logs
➖	ddot_metrics_sum_delta	memory utilization	+0.29	[+0.08, +0.50]	1	Logs
➖	uds_dogstatsd_20mb_12k_contexts_20_senders	memory utilization	+0.17	[+0.12, +0.23]	1	Logs
➖	file_tree	memory utilization	+0.06	[+0.01, +0.11]	1	Logs
➖	file_to_blackhole_0ms_latency	egress throughput	+0.05	[-0.44, +0.55]	1	Logs
➖	uds_dogstatsd_to_api_v3	ingress throughput	+0.02	[-0.11, +0.14]	1	Logs
➖	quality_gate_idle	memory utilization	+0.01	[-0.03, +0.06]	1	Logs bounds checks dashboard
➖	uds_dogstatsd_to_api	ingress throughput	+0.01	[-0.11, +0.13]	1	Logs
➖	file_to_blackhole_100ms_latency	egress throughput	+0.01	[-0.04, +0.05]	1	Logs
➖	tcp_dd_logs_filter_exclude	ingress throughput	-0.01	[-0.10, +0.08]	1	Logs
➖	ddot_logs	memory utilization	-0.02	[-0.08, +0.05]	1	Logs
➖	docker_containers_memory	memory utilization	-0.02	[-0.10, +0.06]	1	Logs
➖	file_to_blackhole_1000ms_latency	egress throughput	-0.02	[-0.43, +0.39]	1	Logs
➖	file_to_blackhole_500ms_latency	egress throughput	-0.03	[-0.42, +0.36]	1	Logs
➖	otlp_ingest_metrics	memory utilization	-0.14	[-0.29, +0.01]	1	Logs
➖	ddot_metrics_sum_cumulativetodelta_exporter	memory utilization	-0.22	[-0.45, +0.01]	1	Logs
➖	otlp_ingest_logs	memory utilization	-0.23	[-0.33, -0.13]	1	Logs
➖	quality_gate_idle_all_features	memory utilization	-0.27	[-0.31, -0.23]	1	Logs bounds checks dashboard
➖	tcp_syslog_to_blackhole	ingress throughput	-0.96	[-1.03, -0.89]	1	Logs
➖	quality_gate_logs	% cpu utilization	-1.49	[-2.99, +0.02]	1	Logs bounds checks dashboard

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_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.
• quality_gate_metrics_logs, bounds check intake_connections: 10/10 replicas passed. Gate passed.
• quality_gate_metrics_logs, bounds check lost_bytes: 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 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_all_features, bounds check memory_usage: 10/10 replicas passed. Gate passed.
• quality_gate_idle, bounds check memory_usage: 10/10 replicas passed. Gate passed.
• quality_gate_idle, bounds check intake_connections: 10/10 replicas passed. Gate passed.

[avonengel]

/merge

[gh-worker-devflow-routing-ef8351]

View all feedbacks in Devflow UI.

2026-01-30 06:25:27 UTC ℹ️ Start processing command /merge

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2026-01-30 06:25:32 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in 7.76.x is approximately 49m (p90).

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2026-01-30 06:49:20 UTC ℹ️ MergeQueue: This merge request was merged