A scrape-time collector reports scimesh_tasks/jobs/workers gauges keyed by
status, sourced from cheap GROUP BY queries (StatsRepo), zero-filled across all
known statuses so the dashboard shows flat zeros instead of gaps. A failed
query yields no samples for that scrape rather than crashing it.
Metrics is now built in main so the DB-backed collector can be registered
(NewServer takes *metrics.Metrics; nil self-provisions for tests). Grafana
dashboard gains a Domain state row: tasks/jobs/workers by status and a queue-
depth stat.
make demo-ui now also starts Prometheus (scrapes coordinator:8080/metrics) and
Grafana with a provisioned datasource and a SciMesh Coordinator dashboard
(request rate & p95 by route, status mix, goroutines, RSS). Grafana allows
anonymous viewing so the dashboard opens without a login; admin/admin to edit.
- monitoring/prometheus.yml + grafana provisioning + dashboard JSON
- docker-compose.monitoring.yml overlay (third -f in demo-ui.sh)
- demo prints the Grafana and Prometheus URLs
Efremenko Arhip