Auth: Session cache [main] (#59935)

* Auth: Session cache [v9.2.x] (#59907)

* add cache wrapper

only cache token if not to rotate

Co-authored-by: Kalle Persson <kalle.persson@grafana.com>

anticipate next rotation

Co-authored-by: ievaVasiljeva <ieva.vasiljeva@grafana.com>
Co-authored-by: Kalle Persson <kalle.persson@grafana.com>
Co-authored-by: Gabriel MABILLE <gamab@users.noreply.github.com>
(cherry picked from commit 07a4b2343d59cb593ad128355e1d9217ba493700)

* FeatureToggle: for storing sessions in a Remote Cache

Co-authored-by: ievaVasiljeva <ieva.vasiljeva@grafana.com>
(cherry picked from commit b8a8c15148)

* use feature flag for session cache

* ensure ttl is minimum 1 second

Co-authored-by: ievaVasiljeva <ieva.vasiljeva@grafana.com>
Co-authored-by: Kalle Persson <kalle.persson@grafana.com>
Co-authored-by: Gabriel MABILLE <gamab@users.noreply.github.com>

* ensure 2 ttl window to prevent caching of tokens near rotation

Co-authored-by: Kalle Persson <kalle.persson@grafana.com>

* fix description of toggle

Co-authored-by: gamab <gabi.mabs@gmail.com>
Co-authored-by: ievaVasiljeva <ieva.vasiljeva@grafana.com>
Co-authored-by: Kalle Persson <kalle.persson@grafana.com>
Co-authored-by: Gabriel MABILLE <gamab@users.noreply.github.com>
(cherry picked from commit 2919588a82)

* fix broken quota test

pkg/services/featuremgmt/registry.go

@@ -378,5 +378,10 @@ var (
 			Description: "Use new auth service to perform authentication",
 			State:       FeatureStateAlpha,
 		},
+		{
+			Name:        "sessionRemoteCache",
+			Description: "Enable using remote cache for user sessions",
+			State:       FeatureStateAlpha,
+		},
 	}
 )

pkg/services/featuremgmt/toggles_gen.go

@@ -274,4 +274,8 @@ const (
 	// FlagAuthnService
 	// Use new auth service to perform authentication
 	FlagAuthnService = "authnService"
+
+	// FlagSessionRemoteCache
+	// Enable using remote cache for user sessions
+	FlagSessionRemoteCache = "sessionRemoteCache"
 )