Grafana自定義alert的實現過程

前言

grafana自帶的alert功能是有限的，比如只能對某個query 配置alert，而不能對具體分類，當然我們也可以通過代碼來實現定製化的alert

因要定時監控grafana的數據變化情況，所以本篇文章使用easyswoole的定時器來做講解。

生成key

key爲調用grafana http api 所需的驗證信息

分析要請求的api和傳遞的參數

當然你可以去grafana官方文檔去翻一番http api 章節

Install easyswoole的http-client組件

easyswoole\http-client

composer require easyswoole\http-client

easyswoole 定時器

定時器

代碼實現

<?php
namespace EasySwoole\EasySwoole;

use EasySwoole\Component\Timer;
use EasySwoole\EasySwoole\Swoole\EventRegister;
use EasySwoole\EasySwoole\AbstractInterface\Event;
use EasySwoole\HttpClient\HttpClient;

class EasySwooleEvent implements Event
{
   
   

    public static function initialize()
    {
   
   
        // TODO: Implement initialize() method.
        date_default_timezone_set('Asia/Shanghai');
    }

    public static function mainServerCreate(EventRegister $register)
    {
   
   
        // TODO: Implement mainServerCreate() method.
        // 定時檢測數據是否超過閾值
        Timer::getInstance()->loop(3 * 1000, function () {
   
   
            // 指定要請求的grafana接口
            $httpClient = new HttpClient('http://x.x.x.x./api/tsdb/query');
            // 設置認證信息,grafana 生成的key
            $httpClient->setHeaders([
                'Authorization' => 'Bearer eyJrIjoiS1lTVWhrNjk5cFM1and4Y0kzNmM2SDNXQ2oyMm44Sk'
            ], true, false);
            // 請求參數，這裏可以通過代碼控制from、to等參數
            $params = '{"from":"1612458544257","to":"1612631344257","queries":[{"refId":"A","intervalMs":300000,"maxDataPoints":634,"datasourceId":1,"rawSql":"SELECT\n  $__timeGroupAlias(ctime,5m),\n  category2 AS metric,\n  sum(price) as price\nFROM grafana_price\nWHERE\n  $__timeFilter(ctime) AND (\n    category2 = \"全部\"\n    OR (\"水果\" = category1 and \"全部\" = \"全部\" and category2 <> \"\")\n  )\nGROUP BY 1,2\nORDER BY $__timeGroup(ctime,5m)\n","format":"time_series"}]}';
            $response = $httpClient->postJson($params);
            $data = $response->getBody();
            $data = json_decode($data, true);
            // series 就是拿到的每個二級分類各時間節點的數據
            $series = $data['results']['A']['series'];

            // TODO： 後面就自定義報警(郵件通知、釘釘通知等)了
            
        });
    }

}

series結果

array(2) {
   
   
  [0]=>
  array(2) {
   
   
    ["name"]=>
    string(6) "香蕉"
    ["points"]=>
    array(2) {
   
   
      [0]=>
      array(2) {
   
   
        [0]=>
        int(88)
        [1]=>
        int(1612537500000)
      }
      [1]=>
      array(2) {
   
   
        [0]=>
        int(121)
        [1]=>
        int(1612542000000)
      }
    }
  }
  [1]=>
  array(2) {
   
   
    ["name"]=>
    string(6) "西瓜"
    ["points"]=>
    array(2) {
   
   
      [0]=>
      array(2) {
   
   
        [0]=>
        int(22)
        [1]=>
        int(1612540200000)
      }
      [1]=>
      array(2) {
   
   
        [0]=>
        int(33)
        [1]=>
        int(1612544100000)
      }
    }
  }
}
``