• Prometheus endpoint with metrics:
  • Number of entries in blacklist/whitelist cache, partitioned by group
  • Counter for internal errors
  • Number of total queries, partitioned by client and DNS request type (A, AAAA, PTR, etc)
  • Request duration histogram, partitioned by response type (Blocked, cached, etc)
  • Number of responses, partitioned by response type (Blocked, cached, etc), DNS response code, and reason
• small improvements