chore: initial project import

packaging/systemd/monitor-agent.service

@@ -0,0 +1,43 @@
+[Unit]
+Description=Monitor agent (network line quality collector)
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=exec
+User=monitor
+Group=monitor
+ExecStart=/usr/lib/monitor/monitor-agent --config /etc/monitor/agent.json
+Restart=always
+RestartSec=5
+
+# The agent is a pure collector: it reads its config and identity, never writes files, never starts processes.
+ReadOnlyPaths=/etc/monitor
+NoNewPrivileges=yes
+ProtectSystem=strict
+ProtectHome=yes
+PrivateTmp=yes
+PrivateDevices=yes
+ProtectKernelTunables=yes
+ProtectKernelModules=yes
+ProtectKernelLogs=yes
+ProtectControlGroups=yes
+ProtectClock=yes
+ProtectHostname=yes
+RestrictAddressFamilies=AF_INET AF_INET6
+RestrictNamespaces=yes
+RestrictRealtime=yes
+LockPersonality=yes
+# NativeAOT does not JIT, so writable+executable memory is never needed.
+MemoryDenyWriteExecute=yes
+SystemCallArchitectures=native
+# CAP_NET_RAW only for ICMP target tasks. Ports below 1024 need CAP_NET_BIND_SERVICE (add it in a drop-in).
+CapabilityBoundingSet=CAP_NET_RAW
+AmbientCapabilities=CAP_NET_RAW
+
+MemoryMax=128M
+TasksMax=64
+LimitNOFILE=4096
+
+[Install]
+WantedBy=multi-user.target