Page report list - url working fine but page are missing after few days ? pages are cleaned automaticaly?

i have on my main gitlab page, an index.html with list content of url reports html, these reports are stored as sub group folder of main page with each html report, each build store report

gitlab-page …myproject/
index.hmtl list url
… report1/report.html


After build, that work fine, in the list i got url and i can view my report for the pipeline, but after few days, it is not more available ? why it is not more present ? if you have an idea

it’s content gitlab page cleaned by some gitlab rules ?