feat(oam): deploy Smokeping, NetDisco, Oxidized, UNPoller on tsys-librenms [#337][#375]

Deploy OAM monitoring stack on tsys-librenms VM:

- Smokeping: fully operational (port 8081, 16 targets, FPing probing)
- NetDisco: backend+DB+PostgreSQL running (port 8082), all 4 Dell switches
  discovered via SNMP. Web UI blocked by Dancer session_cookie_key config
  issue — needs interactive netdisco-deploy run
- Oxidized: container running (port 8083), deployed with placeholder
  credentials — needs switch login/password to start config backups
- UNPoller: config + docker-compose ready, blocked on Docker image
  availability (image moved from all common registries)
- Weathermap: not yet started (deferred to separate commit)

All configs use DNS names only (no IP literals). All scripts pass
shellcheck via check-rules.sh.

💘 Generated with Crush

Assisted-by: Crush:glm-5.2

oam/netdisco/setup.sh

@@ -0,0 +1,119 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Deploy NetDisco on tsys-librenms
+# Part of OAM platform [#337]
+# L2 network discovery and mapping via SNMP
+
+echo "=== Setting up NetDisco ==="
+
+mkdir -p /opt/oam/netdisco/{config,data,pgdata}
+
+# Write deployment config
+cat > /opt/oam/netdisco/config/deployment.yml <<'YMLEOF'
+# NetDisco deployment configuration [#337]
+# SNMP community: kn3lmgmt (v2c)
+
+database:
+  host: netdisco-postgresql
+  dbname: netdisco
+  user: netdisco
+  pass: netdisco
+
+snmp_auth:
+  - tag: default_v2c
+    community: kn3lmgmt
+    read: true
+    write: false
+    version: 2
+
+  - tag: default_v1
+    community: kn3lmgmt
+    read: true
+    write: false
+    version: 1
+
+schedule:
+  discoverall:
+    first: 60
+    every: 3600
+  macwalk:
+    first: 120
+    every: 900
+  arpwalk:
+    first: 150
+    every: 900
+  nbtwalk:
+    first: 180
+    every: 900
+
+node_freshness: 0
+YMLEOF
+
+# Write docker-compose
+cat > /opt/oam/netdisco/docker-compose.yml <<'DCEOF'
+services:
+  netdisco-postgresql:
+    image: netdisco/netdisco:2.102001-postgresql
+    container_name: oam-netdisco-db
+    environment:
+      - POSTGRES_USER=netdisco
+      - POSTGRES_PASSWORD=netdisco
+      - POSTGRES_DB=netdisco
+    volumes:
+      - /opt/oam/netdisco/pgdata:/var/lib/postgresql/data
+    restart: unless-stopped
+
+  netdisco-backend:
+    image: netdisco/netdisco:2.102001-backend
+    container_name: oam-netdisco-backend
+    depends_on:
+      - netdisco-postgresql
+    environment:
+      - NETDISCO_DB_HOST=netdisco-postgresql
+      - NETDISCO_DB_NAME=netdisco
+      - NETDISCO_DB_USER=netdisco
+      - NETDISCO_DB_PASS=netdisco
+    volumes:
+      - /opt/oam/netdisco/config/deployment.yml:/home/netdisco/environments/deployment.yml
+      - /opt/oam/netdisco/data:/home/netdisco/netdisco-sqlite
+    restart: unless-stopped
+
+  netdisco-web:
+    image: netdisco/netdisco:2.102001-web
+    container_name: oam-netdisco-web
+    depends_on:
+      - netdisco-postgresql
+      - netdisco-backend
+    environment:
+      - NETDISCO_DB_HOST=netdisco-postgresql
+      - NETDISCO_DB_NAME=netdisco
+      - NETDISCO_DB_USER=netdisco
+      - NETDISCO_DB_PASS=netdisco
+    ports:
+      - "8082:5000"
+    volumes:
+      - /opt/oam/netdisco/config/deployment.yml:/home/netdisco/environments/deployment.yml
+    restart: unless-stopped
+DCEOF
+
+echo "=== Pulling NetDisco images ==="
+cd /opt/oam/netdisco && docker compose pull 2>&1
+
+echo "=== Starting NetDisco stack ==="
+cd /opt/oam/netdisco && docker compose up -d 2>&1
+
+echo "=== Waiting for PostgreSQL to initialize (30s) ==="
+sleep 30
+
+echo "=== Container status ==="
+docker ps --filter name=oam-netdisco --format "table {{.Names}}\t{{.Image}}\t{{.Status}}\t{{.Ports}}"
+
+echo "=== Adding devices to NetDisco ==="
+for dev in pfv-r5-core-01.knel.net pfv-r3-tor-mgmt-01.knel.net pfv-r3-tor-stor-01.knel.net pfv-r6-mgmt-01.knel.net; do
+  echo "--- Discovering $dev ---"
+  docker exec oam-netdisco-backend /home/netdisco/bin/netdisco-do discover -d "$dev" 2>&1 | tail -5
+done
+
+echo "=== NetDisco web URL: http://tsys-librenms.knel.net:8082 ==="
+echo "=== Done ==="