src: add event loop based metrics into node by pabloerhard · Pull Request #62935 · nodejs/node

pabloerhard · 2026-04-24T18:31:31Z

Adds an opt in into monitorEventLoopDelay(), this option adds support for per iteration sampling using libuv hooks, while preserving the existing timer based approach.

When the new samplePerIteration option is set to true, monitorEventLoopDelay() samples directly from event loop iterations instead of using the interval timer. When samplePerIteration is omitted or false, the existing interval based implementation remains unchanged, including resolution handling and the older interval based trace counters.

Motivation
The interval based implementation has two limitations that the new option addresses:

Inaccurate measurements. Delay was approximated from a timer dispatch jitter (RecordDelta() between timer ticks) rather than measured from the loop itself. Samples had an implicit floor of resolution ms and could miss delays that didn't happen to coincide with a timer tick.
Wasteful wake ups. The timer forced the event loop to iterate every resolution ms just to record a sample, even when the application was otherwise idle and no one was reading the histogram.

This is an alternative implementation to the one in #62934

This PR directly addresses the following issue #56064

codecov · 2026-04-30T22:28:02Z

Codecov Report

❌ Patch coverage is 78.51852% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.64%. Comparing base (80e0f14) to head (27ead1e).
⚠️ Report is 109 commits behind head on main.

Files with missing lines	Patch %	Lines
src/histogram.cc	79.50%	11 Missing and 14 partials ⚠️
src/histogram.h	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #62935      +/-   ##
==========================================
- Coverage   89.65%   89.64%   -0.02%     
==========================================
  Files         708      708              
  Lines      220413   220546     +133     
  Branches    42275    42290      +15     
==========================================
+ Hits       197607   197702      +95     
- Misses      14658    14675      +17     
- Partials     8148     8169      +21

Files with missing lines	Coverage Δ
lib/internal/perf/event_loop_delay.js	`95.95% <100.00%> (+0.12%)`	⬆️
src/node_perf.cc	`86.61% <100.00%> (+0.22%)`	⬆️
src/histogram.h	`50.00% <0.00%> (-10.00%)`	⬇️
src/histogram.cc	`79.08% <79.50%> (+0.12%)`	⬆️

... and 33 files with indirect coverage changes

🚀 New features to boost your workflow:

❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

BridgeAR

Pretty much LGTM, just left two nits. I would feel more comfortable with someone else reviewing it as well.

@addaleax @jasnell maybe?

nodejs-github-bot · 2026-06-17T15:20:57Z

CI: https://ci.nodejs.org/job/node-test-pull-request/74208/

BridgeAR

LGTM, while I would still like to get another LG who works on CPP frequently

Add test coverage for the per iteration event loop delay histogram start and stop callbacks Use disitinct debug tracking keys for the event loop delay histogram callbacks.

Use the super Close method instead of duplicating code

Added extra test to add coverage of the overall functionality of the new ELD histogram.

Update docs to match the event loop delay sampling changes.

The C++ class `ELDHistogram` is the per-iteration sampling implementation that sits next to `IntervalHistogram` (the timer-based one). Its name collided with the JS exposed `ELDHistogram` class that `monitorEventLoopDelay()` returns regardless of sampling mode, making the layering confusing: "ELDHistogram" was both the generic JS concept and the name of one specific C++ backing.

align perf_hooks docs after renaming internal ELDHistogram to IterationHistogram

Added shared templates for duplicated start/stop logic in IntevalHistogram and IterationHistogram.

nodejs-github-bot · 2026-06-24T11:12:09Z

CI: https://ci.nodejs.org/job/node-test-pull-request/74399/

bengl

LGTM, modulo discussion of semver level. That's non-blocking though, since this can land as major if desired.

bengl · 2026-06-24T20:20:06Z

Per discussion offline w/ @BridgeAR, yeah it's a docs-only change, so removing the label.

nodejs-github-bot · 2026-06-24T20:48:28Z

Commit Queue failed

- Loading data for nodejs/node/pull/62935 ✔ Done loading data for nodejs/node/pull/62935 ----------------------------------- PR info ------------------------------------ Title src: add event loop based metrics into node (#62935) ⚠ Could not retrieve the email or name of the PR author's from user's GitHub profile! Branch pabloerhard:pabloerhard/add-event-loop-metrics -> nodejs:main Labels c++, semver-minor, needs-ci Commits 9 - perf_hooks: sample delay per event loop iteration - perf_hooks: test event loop delay fast api callbacks - perf_hooks: format cpp - perf_hooks: use super Close method - test: improve event loop delay sample-per-iteration coverage - doc: update perf_hooks histogram docs - perf_hooks: rename internal ELDHistogram to IterationHistogram - doc: align perf_hooks histogram class name with implementation - perf_hooks: deduplicate histogram Start/Stop via shared templates Committers 1 - Pablo Erhard <pablo.erhardhernandez@datadoghq.com> PR-URL: https://github.com/nodejs/node/pull/62935 Reviewed-By: Bryan English <bryan@bryanenglish.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com> ------------------------------ Generated metadata ------------------------------ PR-URL: https://github.com/nodejs/node/pull/62935 Reviewed-By: Bryan English <bryan@bryanenglish.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com> -------------------------------------------------------------------------------- ℹ This PR was created on Fri, 24 Apr 2026 18:31:31 GMT ✔ Approvals: 3 ✔ - Bryan English (@bengl): https://github.com/nodejs/node/pull/62935#pullrequestreview-4565608564 ✔ - Ruben Bridgewater (@BridgeAR) (TSC): https://github.com/nodejs/node/pull/62935#pullrequestreview-4561486814 ✔ - James M Snell (@jasnell) (TSC): https://github.com/nodejs/node/pull/62935#pullrequestreview-4565515487 ✔ Last GitHub CI successful ℹ Last Full PR CI on 2026-06-24T11:12:09Z: https://ci.nodejs.org/job/node-test-pull-request/74399/ - Querying data for job/node-test-pull-request/74399/ ✔ Build data downloaded ✔ Last Jenkins CI successful -------------------------------------------------------------------------------- ✔ No git cherry-pick in progress ✔ No git am in progress ✔ No git rebase in progress -------------------------------------------------------------------------------- - Bringing origin/main up to date... From https://github.com/nodejs/node * branch main -> FETCH_HEAD ✔ origin/main is now up-to-date - Downloading patch for 62935 From https://github.com/nodejs/node * branch refs/pull/62935/merge -> FETCH_HEAD ✔ Fetched commits as 6f11fe7d67c1..3f20e89304dc -------------------------------------------------------------------------------- [main 1ae0f285c6] perf_hooks: sample delay per event loop iteration Author: pabloerhard <pabloerhard02@gmail.com> Date: Fri Apr 24 14:28:07 2026 -0400 7 files changed, 288 insertions(+), 13 deletions(-) [main 6e4c7e5150] perf_hooks: test event loop delay fast api callbacks Author: pabloerhard <pabloerhard02@gmail.com> Date: Thu Apr 30 13:54:56 2026 -0400 2 files changed, 28 insertions(+), 2 deletions(-) create mode 100644 test/parallel/test-perf-hooks-monitor-event-loop-delay-fast-calls.js [main d46716593b] perf_hooks: format cpp Author: pabloerhard <pabloerhard02@gmail.com> Date: Thu Apr 30 19:33:22 2026 -0400 3 files changed, 30 insertions(+), 49 deletions(-) [main 9aa569e8d4] perf_hooks: use super Close method Author: pabloerhard <pabloerhard02@gmail.com> Date: Tue May 19 17:20:45 2026 -0400 2 files changed, 2 insertions(+), 17 deletions(-) [main b033f8fef1] test: improve event loop delay sample-per-iteration coverage Author: pabloerhard <pabloerhard02@gmail.com> Date: Wed May 27 15:38:42 2026 -0400 1 file changed, 83 insertions(+) [main 81acec265c] doc: update perf_hooks histogram docs Author: pabloerhard <pabloerhard02@gmail.com> Date: Wed May 27 15:48:50 2026 -0400 1 file changed, 20 insertions(+), 8 deletions(-) [main 27fd9191f7] perf_hooks: rename internal ELDHistogram to IterationHistogram Author: Pablo Erhard <pablo.erhardhernandez@datadoghq.com> Date: Wed Jun 17 12:54:37 2026 -0400 5 files changed, 47 insertions(+), 45 deletions(-) [main 32b0132990] doc: align perf_hooks histogram class name with implementation Author: Pablo Erhard <pablo.erhardhernandez@datadoghq.com> Date: Wed Jun 17 12:55:39 2026 -0400 1 file changed, 9 insertions(+), 13 deletions(-) [main 8f7515eb61] perf_hooks: deduplicate histogram Start/Stop via shared templates Author: Pablo Erhard <pablo.erhardhernandez@datadoghq.com> Date: Wed Jun 17 13:43:59 2026 -0400 4 files changed, 49 insertions(+), 31 deletions(-) ✔ Patches applied There are 9 commits in the PR. Attempting autorebase. (node:355) [DEP0190] DeprecationWarning: Passing args to a child process with shell option true can lead to security vulnerabilities, as the arguments are not escaped, only concatenated. (Use `node --trace-deprecation ...` to show where the warning was created) Rebasing (2/18) Executing: git node land --amend --yes --------------------------------- New Message ---------------------------------- perf_hooks: sample delay per event loop iteration

Add a samplePerIteration option to monitorEventLoopDelay that records
event loop delay from libuv event loop iterations instead of the timer
interval sampler. The default remains interval-based; existing uses of
monitorEventLoopDelay() keep behaving the same unless the
samplePerIteration option is passed through.

Signed-off-by: Pablo Erhard <pablo.erhardhernandez@datadoghq.com>
PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

[detached HEAD 99e0587b63] perf_hooks: sample delay per event loop iteration
Author: pabloerhard <pabloerhard02@gmail.com>
Date: Fri Apr 24 14:28:07 2026 -0400
7 files changed, 288 insertions(+), 13 deletions(-)
Rebasing (3/18)
Rebasing (4/18)
Executing: git node land --amend --yes
--------------------------------- New Message ----------------------------------
perf_hooks: test event loop delay fast api callbacks

Add test coverage for the per iteration event loop delay histogram start
and stop callbacks

Use disitinct debug tracking keys for the event loop delay histogram
callbacks.

PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

[detached HEAD 04ff481a23] perf_hooks: test event loop delay fast api callbacks
Author: pabloerhard <pabloerhard02@gmail.com>
Date: Thu Apr 30 13:54:56 2026 -0400
2 files changed, 28 insertions(+), 2 deletions(-)
create mode 100644 test/parallel/test-perf-hooks-monitor-event-loop-delay-fast-calls.js
Rebasing (5/18)
Rebasing (6/18)
Executing: git node land --amend --yes
--------------------------------- New Message ----------------------------------
perf_hooks: format cpp

PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

[detached HEAD 4da679c175] perf_hooks: format cpp
Author: pabloerhard <pabloerhard02@gmail.com>
Date: Thu Apr 30 19:33:22 2026 -0400
3 files changed, 30 insertions(+), 49 deletions(-)
Rebasing (7/18)
Rebasing (8/18)
Executing: git node land --amend --yes
--------------------------------- New Message ----------------------------------
perf_hooks: use super Close method

Use the super Close method instead of duplicating code

PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

[detached HEAD fee3435215] perf_hooks: use super Close method
Author: pabloerhard <pabloerhard02@gmail.com>
Date: Tue May 19 17:20:45 2026 -0400
2 files changed, 2 insertions(+), 17 deletions(-)
Rebasing (9/18)
Rebasing (10/18)
Executing: git node land --amend --yes
--------------------------------- New Message ----------------------------------
test: improve event loop delay sample-per-iteration coverage

Added extra test to add coverage of the overall functionality of the new
ELD histogram.

PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

[detached HEAD de2fd35a9b] test: improve event loop delay sample-per-iteration coverage
Author: pabloerhard <pabloerhard02@gmail.com>
Date: Wed May 27 15:38:42 2026 -0400
1 file changed, 83 insertions(+)
Rebasing (11/18)
Rebasing (12/18)
Executing: git node land --amend --yes
--------------------------------- New Message ----------------------------------
doc: update perf_hooks histogram docs

Update docs to match the event loop delay sampling changes.

PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

[detached HEAD 3a5541879c] doc: update perf_hooks histogram docs
Author: pabloerhard <pabloerhard02@gmail.com>
Date: Wed May 27 15:48:50 2026 -0400
1 file changed, 20 insertions(+), 8 deletions(-)
Rebasing (13/18)
Rebasing (14/18)
Executing: git node land --amend --yes
--------------------------------- New Message ----------------------------------
perf_hooks: rename internal ELDHistogram to IterationHistogram

The C++ class ELDHistogram is the per-iteration sampling
implementation that sits next to IntervalHistogram (the
timer-based one). Its name collided with the JS exposed

ELDHistogram class that monitorEventLoopDelay() returns
regardless of sampling mode, making the layering confusing:
"ELDHistogram" was both the generic JS concept and the name of
one specific C++ backing.

PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

[detached HEAD 69e6b6803a] perf_hooks: rename internal ELDHistogram to IterationHistogram
Author: Pablo Erhard <pablo.erhardhernandez@datadoghq.com>
Date: Wed Jun 17 12:54:37 2026 -0400
5 files changed, 47 insertions(+), 45 deletions(-)
Rebasing (15/18)
Rebasing (16/18)
Executing: git node land --amend --yes
--------------------------------- New Message ----------------------------------
doc: align perf_hooks histogram class name with implementation

align perf_hooks docs after renaming internal ELDHistogram to
IterationHistogram

PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

[detached HEAD 01d5e37ecc] doc: align perf_hooks histogram class name with implementation
Author: Pablo Erhard <pablo.erhardhernandez@datadoghq.com>
Date: Wed Jun 17 12:55:39 2026 -0400
1 file changed, 9 insertions(+), 13 deletions(-)
Rebasing (17/18)
Rebasing (18/18)
Executing: git node land --amend --yes
--------------------------------- New Message ----------------------------------
perf_hooks: deduplicate histogram Start/Stop via shared templates

Added shared templates for duplicated start/stop
logic in IntevalHistogram and IterationHistogram.

PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

[detached HEAD ff43664599] perf_hooks: deduplicate histogram Start/Stop via shared templates
Author: Pablo Erhard <pablo.erhardhernandez@datadoghq.com>
Date: Wed Jun 17 13:43:59 2026 -0400
4 files changed, 49 insertions(+), 31 deletions(-)
Successfully rebased and updated refs/heads/main.

ℹ Add commit-queue-squash label to land the PR as one commit, or commit-queue-rebase to land as separate commits.

https://github.com/nodejs/node/actions/runs/28128367127

nodejs-github-bot · 2026-06-24T23:50:07Z

Landed in c5635b8

Add a samplePerIteration option to monitorEventLoopDelay that records event loop delay from libuv event loop iterations instead of the timer interval sampler. The default remains interval-based; existing uses of monitorEventLoopDelay() keep behaving the same unless the samplePerIteration option is passed through. Signed-off-by: Pablo Erhard <pablo.erhardhernandez@datadoghq.com> PR-URL: nodejs#62935 Reviewed-By: Bryan English <bryan@bryanenglish.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com>

nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. needs-ci PRs that need a full CI run. labels Apr 24, 2026

rochdev reviewed Apr 24, 2026

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Comment thread src/histogram.cc Outdated

addaleax reviewed Apr 24, 2026

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rochdev mentioned this pull request Apr 24, 2026

src: add a native mode to monitorEventLoopDelay #62934

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pabloerhard force-pushed the pabloerhard/add-event-loop-metrics branch from edb66ea to e7093c8 Compare April 28, 2026 20:12

pabloerhard marked this pull request as ready for review April 29, 2026 18:38

pabloerhard force-pushed the pabloerhard/add-event-loop-metrics branch from 6f5cdca to bc0a59c Compare April 30, 2026 17:55

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pabloerhard requested review from addaleax and bengl May 12, 2026 19:51

pabloerhard force-pushed the pabloerhard/add-event-loop-metrics branch from 27ead1e to 3b21617 Compare May 19, 2026 21:21

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Comment thread test/sequential/test-performance-eventloopdelay.js

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github-actions Bot removed the request-ci Add this label to start a Jenkins CI on a PR. label Jun 17, 2026

pabloerhard force-pushed the pabloerhard/add-event-loop-metrics branch from 71f121f to 88fce8d Compare June 17, 2026 16:56

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pabloerhard force-pushed the pabloerhard/add-event-loop-metrics branch from 50f8eab to 29b708d Compare June 18, 2026 13:32

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BridgeAR requested review from Qard, jasnell and legendecas June 18, 2026 15:24

pabloerhard and others added 8 commits June 23, 2026 18:03

perf_hooks: test event loop delay fast api callbacks

630a62c

Add test coverage for the per iteration event loop delay histogram start and stop callbacks Use disitinct debug tracking keys for the event loop delay histogram callbacks.

perf_hooks: format cpp

6363bc8

perf_hooks: use super Close method

c50b0fb

Use the super Close method instead of duplicating code

test: improve event loop delay sample-per-iteration coverage

164ea8a

Added extra test to add coverage of the overall functionality of the new ELD histogram.

doc: update perf_hooks histogram docs

26b7684

Update docs to match the event loop delay sampling changes.

doc: align perf_hooks histogram class name with implementation

2583bbf

align perf_hooks docs after renaming internal ELDHistogram to IterationHistogram

perf_hooks: deduplicate histogram Start/Stop via shared templates

3f20e89

Added shared templates for duplicated start/stop logic in IntevalHistogram and IterationHistogram.

pabloerhard force-pushed the pabloerhard/add-event-loop-metrics branch from 7666e61 to 3f20e89 Compare June 23, 2026 22:10

BridgeAR approved these changes Jun 24, 2026

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bengl approved these changes Jun 24, 2026

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bengl added the semver-major PRs that contain breaking changes and should be released in the next major version. label Jun 24, 2026

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nodejs-github-bot merged commit c5635b8 into nodejs:main Jun 24, 2026
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Signed-off-by: Pablo Erhard <pablo.erhardhernandez@datadoghq.com> PR-URL: #62935 Reviewed-By: Bryan English <bryan@bryanenglish.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #62935 Reviewed-By: Bryan English <bryan@bryanenglish.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #62935 Reviewed-By: Bryan English <bryan@bryanenglish.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #62935 Reviewed-By: Bryan English <bryan@bryanenglish.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #62935 Reviewed-By: Bryan English <bryan@bryanenglish.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #62935 Reviewed-By: Bryan English <bryan@bryanenglish.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #62935 Reviewed-By: Bryan English <bryan@bryanenglish.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #62935 Reviewed-By: Bryan English <bryan@bryanenglish.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #62935 Reviewed-By: Bryan English <bryan@bryanenglish.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com>

[detached HEAD ff43664599] perf_hooks: deduplicate histogram Start/Stop via shared templates Author: Pablo Erhard <pablo.erhardhernandez@datadoghq.com> Date: Wed Jun 17 13:43:59 2026 -0400 4 files changed, 49 insertions(+), 31 deletions(-) Successfully rebased and updated refs/heads/main.

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Signed-off-by: Pablo Erhard <pablo.erhardhernandez@datadoghq.com>
PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #62935
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

[detached HEAD ff43664599] perf_hooks: deduplicate histogram Start/Stop via shared templates
Author: Pablo Erhard <pablo.erhardhernandez@datadoghq.com>
Date: Wed Jun 17 13:43:59 2026 -0400
4 files changed, 49 insertions(+), 31 deletions(-)
Successfully rebased and updated refs/heads/main.