I'm using Jenkins blue ocean to create multi branches pipeline for my project. I have 3 different pipelines for 3 repositories in my organization. I have been this for haft a year and everything was OK.

This problem happened yesterday, I don't know the cause, just see the result of it. It seems all the pipelines in all branches across all repositories were run. I received a lot of alerts from my monitoring system saying that Jenkins was under very high load. When I come to check, surprisingly all my historical jobs were lost. All branches now start from #1. All branches failed, I don't know what triggered those builds but for sure not us, I've checked all repositories and there are no commits during last night (we use commit-hook and don't run nightly). The only lead I have is the "Branch Indexing" message which appeared in the commit message summary.