[Backport 7.58.x] Fix duplicate tags in TCP/UDP logs

[andrewqian2001datadog]

What does this PR do?

Backports commit #29780 into 7.58.x

Below is copied from previous PR.

Fixes bug where duplicate tags occur in UDP/TCP logs

Motivation

Issue

Describe how to test/QA your changes

Inside conf.yaml, add the following
Create the file if needed dev/dist/conf.d/test.d/conf.yaml

logs:
  - type: udp
    port: 10518
    service: "test_app"
    source: "test_app_src"
    tags:
      - "name:integrationtag"

Inside Datadog.yaml, enable logs and have tags as well

logs_enabled: true
tags:
  - "name:hosttag"

Run the agent
./bin/agent/agent run -c bin/agent/dist/datadog.yaml
In a different terminal, get the logs from the agent
./bin/agent/agent stream-logs -c bin/agent/dist/datadog.yaml
In a different terminal, send logs to the agent
echo -n "this is my log" | nc -u -w 1 127.0.0.1 10518
Ensure that the tags are not duplicated in the terminal that gets the logs

Different QA steps are also provided in the ticket if needed

[pr-commenter]

Test changes on VM

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

inv create-vm --pipeline-id=46214530 --os-family=ubuntu

Note: This applies to commit 9793b76

[pr-commenter]

Regression Detector

Regression Detector Results

Run ID: ba74016c-020f-4be9-90c7-1ee776df8e08 Metrics dashboard Target profiles

Baseline: 1f5f2cc
Comparison: 9793b76

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
➖	pycheck_lots_of_tags	% cpu utilization	+2.35	[-0.26, +4.96]	1	Logs
➖	file_tree	memory utilization	+0.22	[+0.10, +0.34]	1	Logs
➖	tcp_dd_logs_filter_exclude	ingress throughput	+0.00	[-0.01, +0.01]	1	Logs
➖	uds_dogstatsd_to_api	ingress throughput	-0.00	[-0.00, +0.00]	1	Logs
➖	idle	memory utilization	-0.12	[-0.16, -0.07]	1	Logs
➖	tcp_syslog_to_blackhole	ingress throughput	-0.46	[-0.50, -0.41]	1	Logs
➖	uds_dogstatsd_to_api_cpu	% cpu utilization	-0.53	[-1.27, +0.21]	1	Logs
➖	otel_to_otel_logs	ingress throughput	-1.08	[-1.91, -0.26]	1	Logs
➖	basic_py_check	% cpu utilization	-1.89	[-4.76, +0.97]	1	Logs

Bounds Checks

perf	experiment	bounds_check_name	replicates_passed
❌	idle	memory_usage	8/10

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".

[andrewqian2001datadog]

/merge

[dd-devflow]

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The median merge time in 7.58.x is 41m.

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