Benchmark: Gitaly on Btrfs filesystem

Objective

Benchmark Gitaly on XFS vs ext4 using the framework from #6732. Provide tuning guidance and production recommendation.

Filesystems: Btrfs (primary), ext4 (baseline)
Workloads: The current mix of RPCs defined in master's k6-benchmark.js is a minimum workload that needs to be run. If additional workloads with different RPCs need to be run, start another report.
Test with and without transactions

Depends on gitaly application level changes in #6921

Edited Oct 12, 2025 by Emily Chui

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