Authn: Stat registration [9.4.x] (#63504)

Authn: Stat registration (#62934)

* reorganize auth usage stats

* usage stat privilege elevators

* stat count of modified role

* cfg related info

* add authn anon client

* kv store

* ensure anon enabled is collected even if client is not registered

* fix usage stats test

(cherry picked from commit 14a78b58e9)

pkg/services/authn/authnimpl/usage_stats.go

@@ -0,0 +1,55 @@
+package authnimpl
+
+import (
+	"context"
+
+	"github.com/grafana/grafana/pkg/services/authn"
+	"github.com/grafana/grafana/pkg/setting"
+)
+
+func (s *Service) getUsageStats(ctx context.Context) (map[string]interface{}, error) {
+	m := map[string]interface{}{}
+
+	// Add stats about auth configuration
+	authTypes := map[string]bool{}
+	authTypes["basic_auth"] = s.cfg.BasicAuthEnabled
+	authTypes["ldap"] = s.cfg.LDAPEnabled
+	authTypes["auth_proxy"] = s.cfg.AuthProxyEnabled
+	authTypes["anonymous"] = s.cfg.AnonymousEnabled
+
+	for authType, enabled := range authTypes {
+		enabledValue := 0
+		if enabled {
+			enabledValue = 1
+		}
+		m["stats.auth_enabled."+authType+".count"] = enabledValue
+	}
+
+	// Add stats about privilege elevators.
+	// FIXME: Move this to accesscontrol OSS.
+	// FIXME: Access Control OSS usage stats is currently disabled if Enterprise is enabled.
+	m["stats.authz.viewers_can_edit.count"] = 0
+	if setting.ViewersCanEdit {
+		m["stats.authz.viewers_can_edit.count"] = 1
+	}
+
+	m["stats.authz.editors_can_admin.count"] = 0
+	if s.cfg.EditorsCanAdmin {
+		m["stats.authz.editors_can_admin.count"] = 1
+	}
+
+	for _, client := range s.clients {
+		if usac, ok := client.(authn.UsageStatClient); ok {
+			clientStats, err := usac.UsageStatFn(ctx)
+			if err != nil {
+				s.log.Warn("Failed to get usage stats from client", "client", client.Name(), "error", err)
+			}
+
+			for k, v := range clientStats {
+				m[k] = v
+			}
+		}
+	}
+
+	return m, nil
+}