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NDM: Upgrade pro-bing to fix a windows only bug #27208

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merged 5 commits into from
Jul 3, 2024

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FlorianVeaux
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Internal context: https://datadoghq.atlassian.net/wiki/spaces/II/pages/3860988548/BUG+Windows+Ping+Buffer+Issue

A windows-only issue affects the pro-bing library, described in this issue: prometheus-community/pro-bing#34

With this PR, we replace the pro-bing version to the one from a personal fork from @ken-schneider. Once the PR is merged upstream, we'll move back to the main branch.

@FlorianVeaux FlorianVeaux requested a review from a team as a code owner July 2, 2024 08:13
@FlorianVeaux FlorianVeaux requested a review from a team as a code owner July 2, 2024 08:42
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pr-commenter bot commented Jul 2, 2024

Regression Detector

Regression Detector Results

Run ID: fb63d419-a0f0-41b0-a160-fe088e4d5e69 Metrics dashboard Target profiles

Baseline: 8779d4a
Comparison: 3e3c1e4

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 links
file_tree memory utilization +0.35 [+0.30, +0.40] Logs
idle memory utilization +0.32 [+0.28, +0.36] Logs
otel_to_otel_logs ingress throughput +0.16 [-0.65, +0.97] Logs
uds_dogstatsd_to_api ingress throughput +0.00 [-0.00, +0.00] Logs
tcp_dd_logs_filter_exclude ingress throughput -0.00 [-0.01, +0.01] Logs
pycheck_1000_100byte_tags % cpu utilization -0.75 [-5.52, +4.02] Logs
basic_py_check % cpu utilization -1.18 [-3.78, +1.41] Logs
uds_dogstatsd_to_api_cpu % cpu utilization -1.71 [-2.59, -0.83] Logs
tcp_syslog_to_blackhole ingress throughput -3.61 [-16.16, +8.94] Logs

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".

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Tiny edit

@ken-schneider
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@FlorianVeaux would you mind pulling in the latest changes from the fork? I tested again and my calculation was slightly off.

It's unlikely we'd hit the issue ourselves, but it appears that the buffer needs to be large enough to hold:
p.Size + (ipv4.HeaderLen+8)*2. Even though net doesn't give us the original IP header, the underlying buffer needs to be large enough to hold it

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Updated the hash to point to the latest changes, should be good to go now

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/merge

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dd-devflow bot commented Jul 3, 2024

🚂 MergeQueue: pull request added to the queue

The median merge time in main is 25m.

Use /merge -c to cancel this operation!

@dd-mergequeue dd-mergequeue bot merged commit e1b4c3b into main Jul 3, 2024
197 checks passed
@dd-mergequeue dd-mergequeue bot deleted the flo/fix-probing-windows-bug branch July 3, 2024 16:58
@github-actions github-actions bot added this to the 7.56.0 milestone Jul 3, 2024
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3 participants