datasource: query performance logging

src/datasource-zabbix/datasource.js

@@ -1,4 +1,5 @@
 import _ from 'lodash';
+import config from 'grafana/app/core/config';
 import * as dateMath from 'grafana/app/core/utils/datemath';
 import * as utils from './utils';
 import * as migrations from './migrations';
@@ -18,6 +19,8 @@ export class ZabbixDatasource {
     this.templateSrv = templateSrv;
     this.zabbixAlertingSrv = zabbixAlertingSrv;
 
+    this.enableDebugLog = config.buildInfo.env === 'development';
+
     // Use custom format for template variables
     this.replaceTemplateVars = _.partial(replaceTemplateVars, this.templateSrv);
 
@@ -165,11 +168,21 @@ export class ZabbixDatasource {
    * Query target data for Metrics mode
    */
   queryNumericData(target, timeRange, useTrends, options) {
+    let queryStart, queryEnd;
     let getItemOptions = {
       itemtype: 'num'
     };
     return this.zabbix.getItemsFromTarget(target, getItemOptions)
-    .then(items => this.queryNumericDataForItems(items, target, timeRange, useTrends, options));
+    .then(items => {
+      queryStart = new Date().getTime();
+      return this.queryNumericDataForItems(items, target, timeRange, useTrends, options);
+    }).then(result => {
+      queryEnd = new Date().getTime();
+      if (this.enableDebugLog) {
+        console.log(`Datasource::Performance Query Time (${this.name}): ${queryEnd - queryStart}`);
+      }
+      return result;
+    });
   }
 
   /**