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Discovery Guide

ServiceRadar discovery jobs keep the registry aligned with real-world infrastructure by walking networks, inventory services, and cataloging dependencies. Use discovery to seed the registry before enabling continuous polling.

Mapper Service Overview​

The serviceradar-mapper service is the SNMP-first discovery engine that complements sweep jobs and external imports. It exposes gRPC endpoints (discovery.DiscoveryService and monitoring.AgentService) for on-demand scans, and it can run scheduled discovery without any external trigger. Mapper loads its settings from /etc/serviceradar/mapper.json (mounted from docker/compose/mapper.docker.json in Docker or rendered via the Helm chart) and keeps its own worker pool so discovery does not compete with poller workloads.

Publishing Flow​

  • Newly discovered devices are normalized through the device registry and land in the CNPG device_updates stream with discovery_source = 'mapper'. That keeps reconciliation logic consistent with sweep, Armis, and Sync imports.
  • Interface inventories are written to the discovered_interfaces table, and topology links flow into topology_discovery_events. Use SRQL queries such as in:interfaces time:last_1h limit:20 to spot-check mapper output.
  • Mapper enriches each record with the agent_id, poller_id, and partition defined under stream_config, so downstream alerts and dashboards can segment results by environment.

Configuring mapper.json​

Mapper reads a single JSON document; the most important sections are:

  • workers, max_active_jobs, timeout, retries – govern concurrency and job lifecycle. Keep workers below the number of SNMP sessions your network can tolerate.
  • default_credentials and credentials[] – define global SNMP v2c/v3 credentials plus CIDR-specific overrides. CIDR matches are evaluated in order; list the most specific ranges first.
  • oids – per-discovery-type OID sets. basic, interfaces, and topology ship with sensible defaults, but you can add vendor-specific OIDs as needed.
  • stream_config – names the CNPG streams (device_stream, interface_stream, topology_stream) and tags emitted events with agent_id, poller_id, and optional partition. Defaults point to sweep_results, discovered_interfaces, and topology_discovery_events.
  • scheduled_jobs[] – cron-like definitions that launch discovery on an interval. Each job supplies seeds (IPs, hosts, or subnets), the discovery type (full, basic, interfaces, or topology), credentials override, concurrency, timeout, and retry budget.
  • unifi_apis[] – optional UniFi controller integrations. Provide base_url, api_key, and set insecure_skip_verify only when testing lab controllers.
  • security / logging – mTLS endpoints and OTLP exporter settings so mapper aligns with the wider ServiceRadar transport policies.

For Docker deployments, edit docker/compose/mapper.docker.json and restart the serviceradar-mapper container. For Helm/Kubernetes, override mapper.json via a values file as described in the Helm configuration guide.

Discovery Types​

  • Sweep Jobs – Lightweight ICMP/TCP probes that identify live hosts. Configure CIDR blocks and schedules in the registry; see the Sync guide for API examples.
  • Mapper SNMP Discovery – Mapper-driven SNMP walks that populate inventory, interface, and topology data. Tune jobs in /etc/serviceradar/mapper.json and monitor results with SRQL on device_updates and discovered_interfaces.
  • Service Fingerprints – Port- and banner-based detectors that classify applications. Maintain fingerprints in KV so updates roll out without redeploying pollers.
  • Inventory Imports – External sources such as NetBox or CMDB dumps. Feed them through the Sync service and let reconciliation create or merge registry entries.

Creating Jobs​

  1. Define scopes (CIDRs, tags, tenants) and store them in KV under discovery/jobs/<name>.json.
  2. Assign jobs to pollers by label; larger scopes benefit from multiple pollers sharing the workload.
  3. Schedule frequency based on change rate—daily for core data centers, weekly for branch offices.

Reviewing Results​

  • Discovery events land in CNPG (discovery.events table). Run SRQL queries like SELECT * FROM discovery.events ORDER BY observed_at DESC LIMIT 20;.
  • New devices appear in the registry with the discovered=true flag until validated via SNMP or NetFlow. Use the Service Port Map to triage.
  • Sync workflows can auto-close stale discoveries; adjust thresholds in the Sync configuration.

Best Practices​

  • Whitelist management networks and respect change windows—discovery traffic can look suspicious to IDS tools.
  • Tag discoveries with owners or teams so follow-up tasks route cleanly.
  • Combine discovery with OTEL resource detection to build full-stack visibility from day one.