[15_1_X] Mitigate impact of FPIX hole in UPC reco

[stahlleiton]

backport of #49284

@mandrenguyen

PR validation:

Tested with workflows 182,182.1,143.901,143.902

[cmsbuild]

A new Pull Request was created by @stahlleiton for CMSSW_15_1_X.

It involves the following packages:

• RecoTracker/IterativeTracking (reconstruction)

@cmsbuild, @jfernan2, @mandrenguyen, @srimanob can you please review it and eventually sign? Thanks.
@GiacomoSguazzoni, @VinInn, @VourMa, @dgulhan, @elusian, @felicepantaleo, @gpetruc, @mmasciov, @mmusich, @mtosi, @rovere this is something you requested to watch as well.
@ftenchini, @mandrenguyen, @sextonkennedy you are the release manager for this.

cms-bot commands are listed here

• Backported from Mitigate impact of FPIX hole in UPC reco #49284

[cmsbuild]

cms-bot internal usage

[mandrenguyen]

please test workflow 182,182.1,143.901,143.902

[cmsbuild]

+1

Size: This PR adds an extra 24KB to repository
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-219a14/49203/summary.html
COMMIT: 1c138b9
CMSSW: CMSSW_15_1_X_2025-11-03-1100/el8_amd64_gcc12
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/49285/49203/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially added 1 lines to the logs
• Reco comparison results: 947 differences found in the comparisons
• DQMHistoTests: Total files compared: 56
• DQMHistoTests: Total histograms compared: 4715665
• DQMHistoTests: Total failures: 3039
• DQMHistoTests: Total nulls: 1
• DQMHistoTests: Total successes: 4712605
• DQMHistoTests: Total skipped: 20
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: -0.008 KiB( 55 files compared)
• DQMHistoSizes: changed ( 143.901 ): -0.008 KiB JetMET/SUSYDQM
• Checked 239 log files, 206 edm output root files, 56 DQM output files
• TriggerResults: no differences found

[jfernan2]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_15_1_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_16_0_X is complete. This pull request will now be reviewed by the release team before it's merged. @sextonkennedy, @ftenchini, @mandrenguyen (and backports should be raised in the release meeting by the corresponding L2)

[mandrenguyen]

+1