在 Kibana 面板中显示字段的准确值

Question

I am using NATS in my project and I am trying to display its monitoring data in a Kibana panel. What I need is to display number of connections connected to each server. The raw data for a server is like this:

{
  "server_id": "NACDVKFBUW4C4XA24OOT6L4MDP56MW76J5RJDFXG7HLABSB46DCMWCOW",
  "now": "2019-06-24T14:28:16.520365-07:00",
  "num_connections": 25,
  "total": 25,
  "offset": 0,
  "limit": 1024,
  "connections": [
    {
      "cid": 1,
      "ip": "127.0.0.1",
      "port": 49764,
      "start": "2019-06-24T14:27:25.94611-07:00",
      "last_activity": "2019-06-24T14:27:25.954046-07:00",
      "rtt": "275µs",
      "uptime": "50s",
      "idle": "50s",
      "pending_bytes": 0,
      "in_msgs": 0,
      "out_msgs": 0,
      "in_bytes": 0,
      "out_bytes": 0,
      "subscriptions": 1,
      "name": "NATS Sample Subscriber",
      "lang": "go",
      "version": "1.8.1",
      "subscriptions_list": [
    "hello.world"
      ]
    },
    ...
  ]
}

What I need is a chart which shows num_connections of each server; a simple line chart is fine.

I have tried Count and Unique Count of connections.cid , but it won't show the correct value. The only ways that comes into my mind to achieve my needs are either showing the exact value of num_connections or displaying the length of connections ; but I'm not sure if there are any possible ways to do this in Kibana .

BTW, index is a simple nats-connz* wildcard without any time filed.

Answer 1

if by a Kibana panel you mean a visualization that you could add to a dashboard, then you might consider using Lens . What you would need to do is to

1. Go to Kibana > Visualize
2. Click on the Create Visualization button, and then click on Lens
3. Select the nats-connz* index pattern from the dropdown (if you haven't created an index pattern yet, do that first )
4. Drag the now field from the left column and drop it into the central area
5. Drag the num_connections field from the left column and drop it into the central area
6. Select the Line type of visualization from the dropdown menu

If your version of Kibana doesn't include Lens, you can

1. Go to Kibana > Visualize
2. Click on the Create Visualization button, and then click on TSVB
3. In the Panel Options tab, type nats-connz* into the Index pattern field (if you haven't created an index pattern yet, do that first ), then set now into the Time Field field
4. In the Data panel, set the Max aggregation for the num_connections field

Answer 2

I have solved the issue by using the TopHit aggregator.