Prometheus: Add support to make parallel queries (#90316)

* Add support for prometheus datasource to make parallel queries

* Incorporate review comments

* Update pkg/promlib/querydata/request.go

Co-authored-by: ismail simsek <ismailsimsek09@gmail.com>

* Fix lint

* Add parallel queries behind feature flag

* Fixing lint issue

* Update go.mod

* Update pkg/promlib/querydata/request.go

* Update pkg/promlib/querydata/request.go

---------

Co-authored-by: ismail simsek <ismailsimsek09@gmail.com>
Co-authored-by: Charandas <542168+charandas@users.noreply.github.com>

pkg/services/featuremgmt/registry.go

@@ -319,6 +319,13 @@ var (
 			FrontendOnly: false,
 			Owner:        grafanaObservabilityMetricsSquad,
 		},
+		{
+			Name:         "prometheusRunQueriesInParallel",
+			Description:  "Enables running Prometheus queries in parallel",
+			Stage:        FeatureStagePrivatePreview,
+			FrontendOnly: false,
+			Owner:        grafanaObservabilityMetricsSquad,
+		},
 		{
 			Name:           "prometheusDataplane",
 			Description:    "Changes responses to from Prometheus to be compliant with the dataplane specification. In particular, when this feature toggle is active, the numeric `Field.Name` is set from 'Value' to the value of the `__name__` label.",

pkg/services/featuremgmt/toggles_gen.csv

@@ -40,6 +40,7 @@ prometheusMetricEncyclopedia,GA,@grafana/observability-metrics,false,false,true
 influxdbBackendMigration,GA,@grafana/observability-metrics,false,false,true
 influxqlStreamingParser,experimental,@grafana/observability-metrics,false,false,false
 influxdbRunQueriesInParallel,privatePreview,@grafana/observability-metrics,false,false,false
+prometheusRunQueriesInParallel,privatePreview,@grafana/observability-metrics,false,false,false
 prometheusDataplane,GA,@grafana/observability-metrics,false,false,false
 lokiMetricDataplane,GA,@grafana/observability-logs,false,false,false
 lokiLogsDataplane,experimental,@grafana/observability-logs,false,false,false

pkg/services/featuremgmt/toggles_gen.go

@@ -171,6 +171,10 @@ const (
 	// Enables running InfluxDB Influxql queries in parallel
 	FlagInfluxdbRunQueriesInParallel = "influxdbRunQueriesInParallel"
 
+	// FlagPrometheusRunQueriesInParallel
+	// Enables running Prometheus queries in parallel
+	FlagPrometheusRunQueriesInParallel = "prometheusRunQueriesInParallel"
+
 	// FlagPrometheusDataplane
 	// Changes responses to from Prometheus to be compliant with the dataplane specification. In particular, when this feature toggle is active, the numeric `Field.Name` is set from 'Value' to the value of the `__name__` label.
 	FlagPrometheusDataplane = "prometheusDataplane"

pkg/services/featuremgmt/toggles_gen.json

@@ -2183,6 +2183,18 @@
         "frontend": true
       }
     },
+    {
+      "metadata": {
+        "name": "prometheusRunQueriesInParallel",
+        "resourceVersion": "1720677541862",
+        "creationTimestamp": "2024-07-11T05:59:01Z"
+      },
+      "spec": {
+        "description": "Enables running Prometheus queries in parallel",
+        "stage": "privatePreview",
+        "codeowner": "@grafana/observability-metrics"
+      }
+    },
     {
       "metadata": {
         "name": "publicDashboards",