Add debugging services

docs/libraries/bolt/DEBUGGING_SERVICES.md

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+# Debugging Services
+
+## Reading logs
+
+Use the `bolt logs` command to read a service's logs. See `bolt logs --help` for more options.
+
+Remember that you can only read the logs of an executable (i.e. API services, workers, and standalone services), not libraries (i.e. operations).
+
+## Metrics
+
+Rivet exposes Prometheus metrics for as many parameters as possible.
+
+If you have Cloudflare Access configured, visit `https://prometheus-svc.MAIN_DOMAIN` where `MAIN_DOMAIN` is the value of `dns.domain.main`. From here, you can query metrics from all of the infrastructure & from Rivet services.