Forge serves Prometheus metrics at /_/metrics.
Use prometheus.yml (note metrics_path: /_/metrics, not the default /metrics).
Apply servicemonitor.yaml (adjust the selector to match your Service labels).
Import grafana-dashboard.json and pick your Prometheus data source. It includes
HTTP RED panels and Go runtime panels (go_*, process_*).
Forge application metrics (HTTP request counts, latencies, etc.) are emitted under
the forge_ namespace prefix — e.g. forge_http_requests_total,
forge_http_request_duration_bucket. The namespace is configurable via
metrics.collection.namespace in your Forge config.
Go runtime and process metrics (go_goroutines, go_memstats_*,
process_cpu_seconds_total, etc.) use their standard unprefixed names; they come
from the Go and Process collectors registered directly with the Prometheus registry.