{
	"bsonType": "object",
	"required": ["_id", "firstSeenAt", "lastSeenAt", "serverVersion"],
	"properties": {
		"_id": { "bsonType": "string", "description": "Node id" },
		"firstSeenAt": { "bsonType": "date" },
		"lastSeenAt": { "bsonType": "date" },
		"serverVersion": { "bsonType": "string" },
		"region": { "bsonType": "string" },
		"batchIntervalMs": {
			"bsonType": ["int", "long"],
			"description": "Configured batch interval of the node, in milliseconds",
			"minimum": 1000
		},
		"mediaStats": {
			"bsonType": "bool",
			"description": "Whether the node reports media statistics; absent on documents written before it existed (read as true)"
		},
		"mediaNode": {
			"bsonType": "string",
			"description": "Media node label of the server; absent when it has none",
			"pattern": "^[A-Za-z0-9_.-]{1,128}$"
		},
		"stoppedAt": { "bsonType": "date", "description": "Set by a graceful stop, after the final batch" }
	},
	"additionalProperties": false
}