Each 'git commit'
==> The subfolders are created from the first two characters of your current commit-ID. The files within the subfolders are named from the rest of your commit-ID
This splitting is probably done to avoid thousands of files within a single folder.
Your commitID is 17556a21ebc68ce39bb53f26af9a590eb76d8c46
-> corresponding data is stored within .git/objects/17/556a21ebc68ce39bb53f26af9a590eb76d8c46
Bitbucket Server checks how many loose objects there are in the 17 directory to decide whether a gc needs to be run. The assumption is that loose objects should be reasonably evenly distributed across the different object directories, so the count in 17 is a reasonable indicator. There's nothing special about 17 though..
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