CTPPS ME merging problems in Harvesting step

[rvenditti]

As a follow up of Express job killed at T0 for memory issues at harvesting step in run 356381 (link), we found that the log file shows a problem in merging a ME: "%MSG-e MergeFailure: source 04-Aug-2022 15:58:00 CEST PostBeginProcessBlock Found histograms with different axis limits or different labels 'ROCs hits multiplicity per event vs LS' not merged" The related ME seems to belong to CTPPS: https://github.com/cms-sw/cmssw/blob/5e17661c6ceb84a4c5a853e3546263b01cf83c1b/DQM/CTPPS/plugins/CTPPSPixelDQMSource.cc#L357

Can please CTPPS DQM experts have a look ?

[cmsbuild]

A new Issue was created by @rvenditti .

@Dr15Jones, @perrotta, @dpiparo, @rappoccio, @makortel, @smuzaffar, @qliphy can you please review it and eventually sign/assign? Thanks.

cms-bot commands are listed here

[makortel]

assign dqm

[cmsbuild]

New categories assigned: dqm

@jfernan2,@ahmad3213,@micsucmed,@rvenditti,@emanueleusai,@pmandrik you have been requested to review this Pull request/Issue and eventually sign? Thanks

[makortel]

FYI @cms-sw/ctpps-dpg-l2

[vavati]

I don't understand which could be the issue: the equivalent plots in DQMonline seems ok. These plots have not been modified since long, I guess the problem is elsewhere, not in the plot itself.