Why are there no counters for free space in the file system in the items list?

Question

Zabbix

Hello.
Making an API request to zabbix

zabbix_get=\
    {
        "jsonrpc": "2.0",
        "method": "item.get",
        "params": {
            "output": "extend",
            "hostids": 123,
            "search": {
                "key_": "system"
            },
            "sortfield": "name"
        },
        "auth": authToken.get("result"),
        "id": authToken.get("id")
    }

a server with Linux OS,
as a result, a lot is returned (CPU, etc.), which everything has not been checked, BUT there are no metrics with itemid for Free disk space on / data,
why is it not there and how to solve the problem?

Answer 1

the problem was in search by key

zabbix_get=\
    {
        "jsonrpc": "2.0",
        "method": "item.get",
        "params": {
            "output": "extend",
            "hostids": 123,
            "search": {
                "key_": "vfs.fs.size"
            },
            "sortfield": "name"
        },
        "auth": authToken.get("result"),
        "id": authToken.get("id")
    }