{"answer":"I've confirmed the key findings. Let me verify the metrics rendering and the concurrency claim once more by re-reading the exact lines.\n\nThe `COUNTERS` array (lines 50-57) lists `sweep_blobs_removed` then `sweep_bytes_reclaimed`, while `values()` (lines 94-95) returns `sweep_bytes_reclaimed` then `sweep_blobs_removed`. The zip in `render` (line 107) pairs them positionally, so each counter is published under the other's name.\n\nFor the concurrency claim: `run()` (sweep.rs:82-84) acquires `self.running` then calls `self.sweep(false)`; the admin route (admin.rs:76) calls `app.sweeper.sweep(dry_run)` directly, never touching the `running` Mutex, so the on-demand path bypasses the one-at-a-time lock the module documents and the type is meant to enforce.\n\n🔴 `concurrency` services/proxy/src/routes/admin.rs:76: the on-demand route calls `app.sweeper.sweep(dry_run)` directly, bypassing the `running` Mutex that `Sweeper::run` (sweep.rs:83) acquires; a manual sweep can run concurrently with the background sweep, exactly the double-walk the module doc (sweep.rs:10-12) says the lock prevents, so the two remove from a total each other is changing and the store drops below the ceiling.\n\n🟠 `bug` services/proxy/src/metrics.rs:94: `values()` returns `sweep_bytes_reclaimed` then `sweep_blobs_removed`, but `COUNTERS` (metrics.rs:51-57) lists `sweep_blobs_removed` then `sweep_bytes_reclaimed`; the positional zip in `render` (metrics.rs:107) publishes each counter under the other's name, so `cairn_proxy_sweep_bytes_reclaimed_total` reports blob counts and `cairn_proxy_sweep_blobs_removed_total` reports bytes — the metric `docs/operations.md` tells operators to alert on (operations.md:55) reads wrong.\n\n🟡 `performance` services/proxy/src/routes/admin.rs:76: `reclaim` runs the synchronous, blocking filesystem walk in `sweeper.sweep` on the async handler thread; a sweep over a large store \"legitimately takes longer than ten seconds\" (routes/mod.rs:121) and blocks an axum worker for its whole duration, starving other requests sharing that worker.\n\n🟡 `performance` services/proxy/src/sweep.rs:90: `sweep` does a full synchronous `readdir`/`read_dir` walk of the blob store while running on the tokio async executor (via `run` in main.rs:116 and the admin route); with 65k leaf directories (as the module doc itself notes, sweep.rs:15-18) it blocks runtime worker threads instead of using `spawn_blocking`.","auth":{"mode":"api_key"},"effort":"high","elapsed_secs":731.948,"error":null,"error_kind":null,"instructions":[],"model":"z-ai/glm-5.2","ok":true,"sandbox":{"backend":"macOS Seatbelt","denied_read_roots":[],"environment":["HOME","LANG","LC_ALL","PATH","TERM","TMPDIR"],"mode":"read-only","network":"denied","protected_write_roots":["/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee/.git","/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee/.afi","/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee/.agents","/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee/.codex","/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee/AGENTS.md","/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee/CLAUDE.md"],"readable_paths":["/"],"readable_roots":["/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee","/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee/.git","/bin","/sbin","/usr/bin","/usr/sbin","/usr/lib","/usr/libexec","/usr/share","/System/Library","/Library/Apple","/Library/Filesystems/NetFSPlugins","/Library/Preferences","/private/etc","/private/var/db/timezone","/private/var/db/DarwinDirectory/local/recordStore.data","/private/var/select/developer_dir","/private/var/select/sh","/opt/homebrew/bin","/opt/homebrew/Cellar","/opt/homebrew/etc/gitconfig","/opt/homebrew/lib","/opt/homebrew/opt","/usr/local/bin","/Applications/Xcode.app/Contents/Developer","/Applications/Xcode.app/Contents","/Users/bart.smykla@konghq.com/.local/bin/afi"],"writable_roots":["/private/var/folders/d1/tvmyp5cs1gz38rltf390ddpw0000gn/T/afi-sandbox-1QJH5r"]},"schema_version":1,"source":"openrouter","sources":[{"auth":{"mode":"api_key"},"source":"openrouter","usage":{"cache_read_tokens":398592,"cache_write_tokens":0,"cost_usd":0.222266,"estimated_tokens":0,"input_tokens":39901,"output_tokens":1564,"reasoning_tokens":12702,"requests":17,"total_tokens":452759}}],"system_prompt":{"file":null,"mode":"builtin"},"tools":["read_file","write_file","edit_file","list_dir","search_files","glob_files","run_bash","wait_background"],"usage":{"budget":{"converged":false,"hard_ratio":0.95,"limit_usd":2.0,"soft_ratio":0.8,"spent_usd":0.222266,"stopped":false},"cache_read_tokens":398592,"cache_write_tokens":0,"cost_usd":0.222266,"estimated_tokens":0,"input_tokens":39901,"output_tokens":1564,"reasoning_tokens":12702,"refused_by_approval":0,"refused_by_policy":0,"refused_tool_calls":0,"requests":17,"total_tokens":452759}}