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/dbConnector.js

@@ -134,6 +134,7 @@ function convertGrafanaTSResponse(time_series, items, addHostName) {
       '__zbx_item': { value: item.name },
       '__zbx_item_name': { value: item.name },
       '__zbx_item_key': { value: item.key_ },
+      '__zbx_item_interval': { value: item.delay },
     };
 
     if (_.keys(hosts).length > 0) {
@@ -153,6 +154,7 @@ function convertGrafanaTSResponse(time_series, items, addHostName) {
       target: alias,
       datapoints,
       scopedVars,
+      item
     };
   });