[CWS] add release note with fargate fixes for 7.58.1

[paulcacheux]

What does this PR do?

This PR is just adding a release note matching the 2 CWS backports for 7.58.1:

• [Backport 7.58.x] [CWS] make forkExec nosplit, so that it's not preemptible before the exec #30150
• [backport][CWS] backport #29666 - fix task tags in fargate #30164

Motivation

Describe how to test/QA your changes

Possible Drawbacks / Trade-offs

Additional Notes

[agent-platform-auto-pr]

[Fast Unit Tests Report]

On pipeline 46737870 (CI Visibility). The following jobs did not run any unit tests:

Jobs:

• tests_deb-arm64-py3
• tests_deb-x64-py3
• tests_flavor_dogstatsd_deb-x64
• tests_flavor_heroku_deb-x64
• tests_flavor_iot_deb-x64
• tests_rpm-arm64-py3
• tests_rpm-x64-py3
• tests_windows-x64

If you modified Go files and expected unit tests to run in these jobs, please double check the job logs. If you think tests should have been executed reach out to #agent-devx-help

[pr-commenter]

Regression Detector

Regression Detector Results

Run ID: 14f9554b-d4c6-492d-8ea0-99691439044b Metrics dashboard Target profiles

Baseline: cf39839
Comparison: a8ca627

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

No significant changes in experiment optimization goals

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

There were no significant changes in experiment optimization goals at this confidence level and effect size tolerance.

Fine details of change detection per experiment

perf	experiment	goal	Δ mean %	Δ mean % CI	trials	links
➖	uds_dogstatsd_to_api_cpu	% cpu utilization	+0.91	[+0.16, +1.66]	1	Logs
➖	tcp_syslog_to_blackhole	ingress throughput	+0.38	[+0.32, +0.44]	1	Logs
➖	idle	memory utilization	+0.26	[+0.22, +0.31]	1	Logs
➖	uds_dogstatsd_to_api	ingress throughput	-0.00	[-0.00, +0.00]	1	Logs
➖	tcp_dd_logs_filter_exclude	ingress throughput	-0.00	[-0.01, +0.01]	1	Logs
➖	file_tree	memory utilization	-0.02	[-0.14, +0.10]	1	Logs
➖	basic_py_check	% cpu utilization	-0.27	[-3.04, +2.49]	1	Logs
➖	pycheck_lots_of_tags	% cpu utilization	-1.23	[-3.73, +1.27]	1	Logs
➖	otel_to_otel_logs	ingress throughput	-1.36	[-2.19, -0.53]	1	Logs

Bounds Checks

perf	experiment	bounds_check_name	replicates_passed
❌	idle	memory_usage	6/10

Explanation

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".

[buraizu]

Approving with a few minor updates requested for the release note

[paulcacheux]

/merge

[dd-devflow]

🚂 MergeQueue: pull request added to the queue

The median merge time in 7.58.x is 40m.

Use /merge -c to cancel this operation!