Use Data frames response format (#1099)

* Use data frames for numeric data

* Use data frames for text data

* Use data frames for IT services

* fix multiple series

* Convert to the wide format if possible

* Fix table format for text data

* Add refId to the data frames

* Align time series from Zabbix API

* Fill gaps with nulls

* Fix moving average functions

* Option for disabling data alignment

* remove unused logging

* Add labels to data frames

* Detect units

* Set min and max for if percent unit used

* Use value mapping from Zabbix

* Rename unitConverter -> convertZabbixUnit

* More units

* Add missing points in front of each series

* Fix handling table data

* fix db connector data frames handling

* fix it services data frames handling

* Detect all known grafana units

* Chore: remove unused logging

* Fix problems format

* Debug logging: show original units

* Add global option for disabling data alignment

* Add tooltip for the disableDataAlignment feature

* Add note about query options

* Functions for aligning timeseries on the backend

src/datasource-zabbix/zabbix/connectors/zabbix_api/zabbixAPIConnector.ts

@@ -161,11 +161,15 @@ export class ZabbixAPIConnector {
   getItems(hostids, appids, itemtype) {
     const params: any = {
       output: [
-        'name', 'key_',
+        'name',
+        'key_',
         'value_type',
         'hostid',
         'status',
-        'state'
+        'state',
+        'units',
+        'valuemapid',
+        'delay'
       ],
       sortfield: 'name',
       webitems: true,
@@ -651,6 +655,15 @@ export class ZabbixAPIConnector {
 
     return this.request('script.execute', params);
   }
+
+  getValueMappings() {
+    const params = {
+      output: 'extend',
+      selectMappings: "extend",
+    };
+
+    return this.request('valuemap.get', params);
+  }
 }
 
 function filterTriggersByAcknowledge(triggers, acknowledged) {