show or hide `client_id` label in the rule expression

```
"Rules": [
    {
        "Record": "",
        "Alert": "alert",
        "Expr": "alert_test{client_id=\"1\"} > 10", # show or hide
        "For": 60000000000,
        "Labels": {
            "client_id": "1",
            "severity": "warning"
        },
        "Annotations": {
            "summary": "Testing alert"
        }
    }
]
```