f195ff5b3d
**Problem:** Fusion had no Prometheus-scrapeable metrics surface, so production CPU/health/DB/fleet observability had to be inferred from logs and ad-hoc monitoring. **Fix:** Expose a Prometheus-text `/metrics` HTTP endpoint on the dashboard with runtime + domain samplers: request latency quantiles (p50/p95/max), last-request-age freeze indicator, CPU user/system, RSS/heap, child-process spawn rates by kind, git children count, PG tps, active/idle/total projects, running agents, and board task counts. Scraped at 5s by the existing Prometheus/Grafana stack (fusion-observability). **Includes:** full test coverage for the Prometheus text parser and each sampler. <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Added a public, unauthenticated `/metrics` endpoint with Prometheus-formatted dashboard, runtime, process, database, and domain metrics. * Added request latency, resource usage, child-process, project activity, agent, and task metrics. * Metrics remain available in headless mode and provide stable snapshots without triggering additional data writes or on-demand I/O. * **Documentation** * Documented metric families, sampling behavior, and degraded-operation handling. * **Tests** * Added comprehensive coverage for collection, formatting, parsing, endpoint behavior, and sampler lifecycle. <!-- end of auto-generated comment: release notes by coderabbit.ai --> --------- Co-authored-by: Fusion <noreply@runfusion.ai>
Changeset Format Guide
Each changeset file in this directory describes one user-facing change for release notes.
Required body format
---
"@runfusion/fusion": minor
---
summary: Add a Command Center productivity control for LOC backfills.
category: feature
dev: Uses the new `fn_backfill_loc` tool; settings key `commandCenter.locBackfill`.
Fields
| Field | Required | Description |
|---|---|---|
summary |
Yes | One line, user-facing, max 120 chars. Describe what changed for the operator. |
category |
Yes | One of: feature, fix, breaking, security, performance, internal. |
dev |
No | Developer or migration detail. Preserved in per-package CHANGELOGs but excluded from distilled release notes. |
Audience
The summary is the only content that appears in end-user release notes by default. Write for Fusion operators — describe behavior, fixes, and what changed. Avoid internal class names, file paths, and implementation detail.
Bump types
patch— bug fixes, internal changesminor— new features, CLI additions, toolsmajor— breaking changes
Validation
Run pnpm check:changesets to validate. The linter runs in the PR-check gate and test:gate. Legacy freeform changesets pass with a warning during the transition period.