host id as alias function (#1913)

docs/sources/reference/functions.md

@@ -337,6 +337,7 @@ Following template variables available for using in `setAlias()` and `replaceAli
 - `$__zbx_item`, `$__zbx_item_name` - item name
 - `$__zbx_item_key` - item key
 - `$__zbx_host_name` - visible name of the host
+- `$__zbx_host_id` - id of the host
 - `$__zbx_host` - technical name of the host
 
 Examples:
@@ -400,9 +401,9 @@ For more details see [String.prototype.replace()](https://developer.mozilla.org/
 **NOTE:** Other transforms in Grafana Dashboard, like ["Join by label"](https://grafana.com/docs/grafana/latest/panels-visualizations/query-transform-data/transform-data/#join-by-labels) will overwrite the alias functions.
 This will happen because the Grafana Dashboard transforms will be applied on the raw data returned by a query.
 If such issues arise, you can always use other Dashboard transforms, like:
-* [Rename by regex](https://grafana.com/docs/grafana/latest/panels-visualizations/query-transform-data/transform-data/#rename-by-regex) for fields names
-* [Value mappings > Regex ](https://grafana.com/docs/grafana/latest/panels-visualizations/configure-value-mappings/#regex) for cell values
 
+- [Rename by regex](https://grafana.com/docs/grafana/latest/panels-visualizations/query-transform-data/transform-data/#rename-by-regex) for fields names
+- [Value mappings > Regex ](https://grafana.com/docs/grafana/latest/panels-visualizations/configure-value-mappings/#regex) for cell values
 
 Examples:
 

pkg/datasource/response_handler.go

@@ -94,6 +94,7 @@ func seriesToDataFrame(series *timeseries.TimeSeriesData, valuemaps []zabbix.Val
 
 	if len(item.Hosts) > 0 {
 		scopedVars["__zbx_host"] = ScopedVar{Value: item.Hosts[0].Name}
+		scopedVars["__zbx_host_id"] = ScopedVar{Value: item.Hosts[0].ID}
 		scopedVars["__zbx_host_name"] = ScopedVar{Value: item.Hosts[0].Name}
 		valueField.Labels["host"] = item.Hosts[0].Name
 	}

src/datasource/responseHandler.ts

@@ -59,6 +59,7 @@ function convertHistory(history, items, addHostName, convertPointCallback) {
       const host = _.find(hosts, { hostid: item.hostid });
       scopedVars['__zbx_host'] = { value: host.host };
       scopedVars['__zbx_host_name'] = { value: host.name };
+      scopedVars['__zbx_host_id'] = { value: host.id };
 
       // Only add host when multiple hosts selected
       if (_.keys(hosts).length > 1 && addHostName) {