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/stats/models.go

@@ -77,6 +77,9 @@ type NotifierUsageStats struct {
 
 type GetAlertNotifierUsageStatsQuery struct{}
 
+type AnonymousStats struct {
+	ActiveDevices int64 `json:"activeDevices"`
+}
 type AdminStats struct {
 	Orgs                int64 `json:"orgs"`
 	Dashboards          int64 `json:"dashboards"`
@@ -101,6 +104,7 @@ type AdminStats struct {
 	DailyActiveViewers  int64 `json:"dailyActiveViewers"`
 	DailyActiveSessions int64 `json:"dailyActiveSessions"`
 	MonthlyActiveUsers  int64 `json:"monthlyActiveUsers"`
+	AnonymousStats
 }
 
 type GetAdminStatsQuery struct{}

pkg/services/stats/statstest/stats.go

@@ -7,6 +7,7 @@ import (
 )
 
 type FakeService struct {
+	ExpectedAdminStats             *stats.AdminStats
 	ExpectedSystemStats            *stats.SystemStats
 	ExpectedDataSourceStats        []*stats.DataSourceStats
 	ExpectedDataSourcesAccessStats []*stats.DataSourceAccessStats
@@ -20,7 +21,7 @@ func NewFakeService() *FakeService {
 }
 
 func (s *FakeService) GetAdminStats(ctx context.Context, query *stats.GetAdminStatsQuery) (*stats.AdminStats, error) {
-	return nil, s.ExpectedError
+	return s.ExpectedAdminStats, s.ExpectedError
 }
 
 func (s *FakeService) GetAlertNotifiersUsageStats(ctx context.Context, query *stats.GetAlertNotifierUsageStatsQuery) ([]*stats.NotifierUsageStats, error) {