How to generate alert for specific host name

Elastic Stack Kibana
1 
Hi,

I want to set a trigger when cpu usage reached more than 90% on beat.hostname is elsearchdv1

below are my watcher.json



{
  "trigger": {
    "schedule": {
      "interval": "1s"
    }
  },
  "input": {
    "search": {
      "request": {
        "search_type": "query_then_fetch",
        "indices": [
          "metricbeat-*"
        ],
        "types": [],
        "body": {
          "query": {
              
            "match": {
              "beat.hostname": "elsearchdv1"
            },
            "range": {
              "system.cpu.user.pct": {
                "gt": "0.90"
              }
            }
          }
        }
      }
    }
  },
  "condition": {
    "compare": {
      "ctx.payload.hits.total": {
        "gte": 1
      }
    }
  },
  "actions": {
    "send_email": {
      "email": {
        "profile": "standard",
        "to": [
          "xxx@yyy.com"
        ],
        "subject": "Watcher Notification",
        "body": {
          "text": "CPU Threshold for {{ctx.payload.hits.hits.0._source.host}} exceeded"
        }
      }
    }
  }
}


its not generating an alert please help me in this.
2

You should use the Threshold alert builder for this. It's in the UI in Kibana, next to the Advanced watch.