Datasources: Add concurrency number to the settings (#81212)

add concurrency to the settings

conf/defaults.ini

@@ -429,6 +429,11 @@ default_home_dashboard_path =
 # Upper limit of data sources that Grafana will return. This limit is a temporary configuration and it will be deprecated when pagination will be introduced on the list data sources API.
 datasource_limit = 5000
 
+# Number of queries to be executed concurrently. Only for the datasource supports concurrency.
+# For now only Loki and InfluxDB (with influxql) are supporting concurrency behind the feature flags.
+# Check datasource documentations for enabling concurrency.
+concurrent_query_count = 10
+
 
 ################################### SQL Data Sources #####################
 [sql_datasources]

pkg/setting/setting.go

@@ -345,6 +345,8 @@ type Cfg struct {
 
 	// Data sources
 	DataSourceLimit int
+	// Number of queries to be executed concurrently. Only for the datasource supports concurrency.
+	ConcurrentQueryCount int
 
 	// SQL Data sources
 	SqlDatasourceMaxOpenConnsDefault    int
@@ -1933,6 +1935,7 @@ func (cfg *Cfg) GetContentDeliveryURL(prefix string) (string, error) {
 func (cfg *Cfg) readDataSourcesSettings() {
 	datasources := cfg.Raw.Section("datasources")
 	cfg.DataSourceLimit = datasources.Key("datasource_limit").MustInt(5000)
+	cfg.ConcurrentQueryCount = datasources.Key("concurrent_query_count").MustInt(10)
 }
 
 func (cfg *Cfg) readSqlDataSourceSettings() {