Auth: Add anonymous users view and stats (#78685)

* Add anonymous stats and user table

- anonymous users users page
- add feature toggle `anonymousAccess`
- remove check for enterprise for `Device-Id` header in request
- add anonusers/device count to stats

* promise all, review comments

* make use of promise all settled

* refactoring: devices instead of users

* review comments, moved countdevices to httpserver

* fakeAnonService for tests and generate openapi spec

* do not commit openapi3 and api-merged

* add openapi

* Apply suggestions from code review

Co-authored-by: Alex Khomenko <Clarity-89@users.noreply.github.com>

* formatin

* precise anon devices to avoid confusion

---------

Co-authored-by: Alex Khomenko <Clarity-89@users.noreply.github.com>
Co-authored-by: jguer <me@jguer.space>

pkg/services/featuremgmt/registry.go

@@ -1082,6 +1082,13 @@ var (
 			FrontendOnly: true,
 			Owner:        grafanaBiSquad,
 		},
+		{
+			Name:         "displayAnonymousStats",
+			Description:  "Enables anonymous stats to be shown in the UI for Grafana",
+			Stage:        FeatureStageExperimental,
+			FrontendOnly: true,
+			Owner:        identityAccessTeam,
+		},
 	}
 )
 

pkg/services/featuremgmt/toggles_gen.csv

@@ -146,3 +146,4 @@ alertingSimplifiedRouting,experimental,@grafana/alerting-squad,false,false,false
 logRowsPopoverMenu,experimental,@grafana/observability-logs,false,false,false,true
 pluginsSkipHostEnvVars,experimental,@grafana/plugins-platform-backend,false,false,false,false
 regressionTransformation,experimental,@grafana/grafana-bi-squad,false,false,false,true
+displayAnonymousStats,experimental,@grafana/identity-access-team,false,false,false,true

pkg/services/featuremgmt/toggles_gen.go

@@ -594,4 +594,8 @@ const (
 	// FlagRegressionTransformation
 	// Enables regression analysis transformation
 	FlagRegressionTransformation = "regressionTransformation"
+
+	// FlagDisplayAnonymousStats
+	// Enables anonymous stats to be shown in the UI for Grafana
+	FlagDisplayAnonymousStats = "displayAnonymousStats"
 )