Ensure profiling is fine-grained in the Regression Detector

[blt]

What does this PR do?

This commit updates the environment flags on our experiments to ensure that profiling runs are fine grained through the whole of the run. Updated with reference to the ongoing investigation in #19990

REF SMPTNG-12

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Regression Detector Results

Run ID: 34af9565-fbbc-4c6e-9109-303efd80c342
Baseline: 6b37725
Comparison: fade466
Total datadog-agent CPUs: 7

Explanation

A regression test is an integrated performance test for datadog-agent in a repeatable rig, with varying configuration for datadog-agent. What follows is a statistical summary of a brief datadog-agent run for each configuration across SHAs given above. The goal of these tests are to determine quickly if datadog-agent performance is changed and to what degree by a pull request.

Because a target's optimization goal performance in each experiment will vary somewhat each time it is run, we can only estimate mean differences in optimization goal relative to the baseline target. We express these differences as a percentage change relative to the baseline target, denoted "Δ mean %". These estimates are made to a precision that balances accuracy and cost control. We represent this precision as a 90.00% confidence interval denoted "Δ mean % CI": there is a 90.00% chance that the true value of "Δ mean %" is in that interval.

We decide whether a change in performance is a "regression" -- a change worth investigating further -- if both of the following two criteria are true:

1. The estimated |Δ mean %| ≥ 5.00%. This criterion intends to answer the question "Does the estimated change in mean optimization goal performance have a meaningful impact on your customers?". We assume that when |Δ mean %| < 5.00%, the impact on your customers is not meaningful. We also assume that a performance change in optimization goal is worth investigating whether it is an increase or decrease, so long as the magnitude of the change is sufficiently large.

2. Zero is not in the 90.00% confidence interval "Δ mean % CI" about "Δ mean %". This statement is equivalent to saying that there is at least a 90.00% chance that the mean difference in optimization goal is not zero. This criterion intends to answer the question, "Is there a statistically significant difference in mean optimization goal performance?". It also means there is no more than a 10.00% chance this criterion reports a statistically significant difference when the true difference in mean optimization goal is zero -- a "false positive". We assume you are willing to accept a 10.00% chance of inaccurately detecting a change in performance when no true difference exists.

The table below, if present, lists those experiments that have experienced a statistically significant change in mean optimization goal performance between baseline and comparison SHAs with 90.00% confidence OR have been detected as newly erratic. Negative values of "Δ mean %" mean that baseline is faster, whereas positive values of "Δ mean %" mean that comparison is faster. Results that do not exhibit more than a ±5.00% change in their mean optimization goal are discarded. An experiment is erratic if its coefficient of variation is greater than 0.1. The abbreviated table will be omitted if no interesting change is observed.

No interesting changes in experiment optimization goals with confidence ≥ 90.00% and |Δ mean %| ≥ 5.00%.

Fine details of change detection per experiment.

experiment	goal	Δ mean %	Δ mean % CI	confidence
file_tree	egress throughput	+9.16	[+6.96, +11.37]	100.00%
tcp_syslog_to_blackhole	ingress throughput	+1.12	[+0.98, +1.26]	100.00%
otel_to_otel_logs	ingress throughput	+0.20	[-1.40, +1.80]	16.16%
uds_dogstatsd_to_api_nodist_200MiB	ingress throughput	+0.15	[+0.04, +0.26]	97.49%
trace_agent_msgpack	ingress throughput	+0.01	[-0.10, +0.13]	17.18%
tcp_dd_logs_filter_exclude	ingress throughput	+0.01	[-0.05, +0.07]	26.34%
uds_dogstatsd_to_api_nodist_32MiB	ingress throughput	+0.00	[-0.13, +0.13]	3.54%
trace_agent_json	ingress throughput	+0.00	[-0.13, +0.13]	0.33%
file_to_blackhole	egress throughput	+0.00	[-1.38, +1.38]	0.00%
uds_dogstatsd_to_api_nodist_100MiB	ingress throughput	-0.00	[-0.13, +0.13]	0.33%
uds_dogstatsd_to_api_nodist_64MiB	ingress throughput	-0.00	[-0.13, +0.13]	0.82%
uds_dogstatsd_to_api_nodist_16MiB	ingress throughput	-0.01	[-0.13, +0.12]	7.21%
uds_dogstatsd_to_api_nodist_1MiB	ingress throughput	-0.01	[-0.02, -0.00]	94.47%
uds_dogstatsd_to_api	ingress throughput	-1.10	[-3.17, +0.98]	61.59%