One observation, and where it came from.
198.51.100.74 is not in the backup infrastructure inventory
This observation is part of a written scenario. It did not come off a real network, and nothing on this deployment did.
{
"kind": "security",
"detection_type": "not_backup_infrastructure",
"principal": "ws-0148->198.51.100.74:8443",
"source_address": null,
"asset": null,
"confidence": 0.99
}