I haven't any great expertise here, but If I look at the "atlassian-bitbucket-access.log" log file (within BITBUCKET_HOME), I see the following:
172.16.0.120 | http | i@13J5DP6x17x2603224x0 | - | 2016-03-04 00:17:44,994
| "GET /scm/myProj/configdata.git/info/refs HTTP/1.1"
| "" "git/1.9.5.msysgit.0" | - | - | - | - | - | - |
This seems to be used to get the state of the remote repository (see: https://git-scm.com/book/be/v2/Git-Internals-Transfer-Protocols - info/refs)
Comparing this data with your local repository, SourceTree might determine the asked information.
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