There are hundreds of references to http requests in the source tree, though most seem associated with calling particular AI model providers.
This looks to be the telemetry struct: https://github.com/zed-industries/zed/blob/a7c9c24f40d7e9169...
It appears to crawl your worktrees collecting an inventory of the types of projects you have and is interested in certain named files specificaly: https://github.com/zed-industries/zed/blob/a7c9c24f40d7e9169...