Version 6.3.2 
I configure x-pack in logstash , but unseen monitor of logstash  in kibana's monitor UI
logstash.yml 
xpack.monitoring.collection.enabled: true 
xpack.monitoring.enabled: true 
xpack.monitoring.elasticsearch.url: ["http://192.168.1.168:9200 ","http://192.168.1.169:9200 "] 
xpack.monitoring.elasticsearch.username:  "logstash_system" 
xpack.monitoring.elasticsearch.password:  "logstash_system123456"
             
            
               
               
               
            
            
           
          
            
            
              Are there any error in the logstash logs, or in either ES cluster logs indicating a potential error?
You can also run this query against both  http://192.168.1.168:9200  and http://192.168.1.169:9200  to see if there is any monitoring data on either cluster.
POST .monitoring-logstash-6-*/_search
{
  "size": 1,
  "query": {
    "bool": {
      "filter": [
        {
          "range": {
            "timestamp": {
              "gte": "now-2m",
              "lte": "now"
            }
          }
        }
      ]
    }
  }
}
 
If you find results on one of the clusters (or both), how is your Kibana configured in terms of elasticsearch urls? Read this article for more help here: https://www.elastic.co/guide/en/kibana/current/configuring-monitoring.html 
             
            
               
               
               
            
            
           
          
            
            
              Thank your Reply 
Only  .monitoring-Kibana  and  .monitoring-es  in my cluster
             
            
               
               
               
            
            
           
          
          
            
            
              When  i enable debug mode to start logstash , I find  "xpack.monitoring.enabled: false"  in log file. 
But i do  setting "xpack.monitoring.enabled: true" in logstash.yml
[2019-03-08T17:25:20,171][DEBUG][logstash.runner          ] xpack.management.enabled: false 
[2019-03-08T17:25:20,171][DEBUG][logstash.runner          ] xpack.management.logstash.poll_interval: 5000000000 
[2019-03-08T17:25:20,171][DEBUG][logstash.runner          ] xpack.management.pipeline.id: ["main"] 
[2019-03-08T17:25:20,171][DEBUG][logstash.runner          ] xpack.management.elasticsearch.username: "logstash_system" 
[2019-03-08T17:25:20,172][DEBUG][logstash.runner          ] xpack.management.elasticsearch.url: ["https://localhost:9200 "] 
[2019-03-08T17:25:20,172][DEBUG][logstash.runner          ] xpack.management.elasticsearch.sniffing: false 
[2019-03-08T17:25:20,172][DEBUG][logstash.runner          ] xpack.monitoring.enabled: false 
[2019-03-08T17:25:20,172][DEBUG][logstash.runner          ] xpack.monitoring.elasticsearch.url: ["http://localhost:9200 "] 
[2019-03-08T17:25:20,172][DEBUG][logstash.runner          ] xpack.monitoring.collection.interval: 10000000000 
[2019-03-08T17:25:20,172][DEBUG][logstash.runner          ] xpack.monitoring.collection.timeout_interval: 600000000000 
[2019-03-08T17:25:20,172][DEBUG][logstash.runner          ] xpack.monitoring.elasticsearch.username: "logstash_system" 
[2019-03-08T17:25:20,172][DEBUG][logstash.runner          ] xpack.monitoring.elasticsearch.ssl.verification_mode: "certificate" 
[2019-03-08T17:25:20,172][DEBUG][logstash.runner          ] xpack.monitoring.elasticsearch.sniffing: false 
[2019-03-08T17:25:20,172][DEBUG][logstash.runner          ] xpack.monitoring.collection.pipeline.details.enabled: true 
[2019-03-08T17:25:20,172][DEBUG][logstash.runner          ] xpack.monitoring.collection.config.enabled: true
             
            
               
               
               
            
            
           
          
            
              
                system  
                (system)
                  Closed 
               
              
                  
                    April 5, 2019,  9:33am
                   
                   
              6 
               
             
            
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