This changes the file name for sitemap files[1] generated by misc/cronjobs/sitemap.pl from sitemapNNNN.xml to sitemap_NNNN.xml (it adds an underscore). For whatever reason, Google only seems to fetch sitemap files with an underscore, despite this not being a requirement in the sitemap protocol. This then resulted in pages not being crawled (reducing their discoverability).
[1] Site map files are used by search engines to identify pages on websites that are available for crawling. See https://sitemaps.org/ for more information.
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