Explore: Add Mixed Datasource (#53429)

* Toggle on the mixed mode option

* Ensure switching to mixed gives existing query prev datasource

* WIP - Populate datasource when switching between mixed and not

* WIP - handle change from mixed

* Remove preimport filter, refine filter to work for queries

* WIP debugging datasource transition

* Ensure creating a new query gets target data source if switching with no matches between

* Add mixed datasource to rich history display

* Cleanup console logs, add relevant comments

* Add feature toggle for mixed datasource

* Fix Wrapper tests

* Fix tests!

* Fix test types and add feature tracking

* Remove unnecessary default, remove explore/mixed workarounds for D2E

* Move display text logic to mixed datasource file

* Add in the default query parameters to a generated empty query

* Condense some code

* Apply suggestions from code review

Co-authored-by: Giordano Ricci <me@giordanoricci.com>

* Add more logic around mixed datasource being off for explore

* Build out logic to handle different datasource scenarios

* Add tests

* Finalize last test

* Fix mixed URL with mixed ds off, and relevant test

* Fix datasource to explore workflow

* Add datasource change function, call import queries if needed

* add logic for changing single query ds

Co-authored-by: Giordano Ricci <me@giordanoricci.com>

pkg/services/featuremgmt/registry.go

@@ -155,6 +155,12 @@ var (
 			State:        FeatureStateBeta,
 			FrontendOnly: true,
 		},
+		{
+			Name:         "exploreMixedDatasource",
+			Description:  "Enable mixed datasource in Explore",
+			State:        FeatureStateAlpha,
+			FrontendOnly: true,
+		},
 		{
 			Name:         "tracing",
 			Description:  "Adds trace ID to error notifications",

pkg/services/featuremgmt/toggles_gen.go

@@ -115,6 +115,10 @@ const (
 	// Experimental Explore to Dashboard workflow
 	FlagExplore2Dashboard = "explore2Dashboard"
 
+	// FlagExploreMixedDatasource
+	// Enable mixed datasource in Explore
+	FlagExploreMixedDatasource = "exploreMixedDatasource"
+
 	// FlagTracing
 	// Adds trace ID to error notifications
 	FlagTracing = "tracing"