[Pulp-list] mirrored sync in 3.7.3

[Bin Li (BLOOMBERG/ 120 PARK)]

Happy new year.
I run a mirrored sync with upstream. The sync didn't pick up new rpms in upstream repo. I rerun sync with optimize=false and it synced all rpms. I do see the file names from new rpms are in the filelists.xml.gz of the upstream repodata. Just wondering which repo data does pulp check before starting a optimized mirror sync and why the optimized sync didn't work?
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