[v10.2.x] Plugins: Fix status_source always being "plugin" in plugin request logs (#77436)

Plugins: Fix status_source always being "plugin" in plugin request logs (#77433)

* Plugins: Fix status_source always being "plugin" in plugin logs

* add tests

* Fix TestInstrumentationMiddlewareStatusSource

(cherry picked from commit 46261de32d)

Co-authored-by: Giuseppe Guerra <giuseppe.guerra@grafana.com>

pkg/services/pluginsintegration/pluginsintegration.go

@@ -153,8 +153,16 @@ func NewClientDecorator(
 }
 
 func CreateMiddlewares(cfg *setting.Cfg, oAuthTokenService oauthtoken.OAuthTokenService, tracer tracing.Tracer, cachingService caching.CachingService, features *featuremgmt.FeatureManager, promRegisterer prometheus.Registerer, registry registry.Service) []plugins.ClientMiddleware {
+	var middlewares []plugins.ClientMiddleware
+
+	if features.IsEnabled(featuremgmt.FlagPluginsInstrumentationStatusSource) {
+		middlewares = []plugins.ClientMiddleware{
+			clientmiddleware.NewPluginRequestMetaMiddleware(),
+		}
+	}
+
 	skipCookiesNames := []string{cfg.LoginCookieName}
-	middlewares := []plugins.ClientMiddleware{
+	middlewares = append(middlewares,
 		clientmiddleware.NewTracingMiddleware(tracer),
 		clientmiddleware.NewMetricsMiddleware(promRegisterer, registry, features),
 		clientmiddleware.NewContextualLoggerMiddleware(),
@@ -164,7 +172,7 @@ func CreateMiddlewares(cfg *setting.Cfg, oAuthTokenService oauthtoken.OAuthToken
 		clientmiddleware.NewOAuthTokenMiddleware(oAuthTokenService),
 		clientmiddleware.NewCookiesMiddleware(skipCookiesNames),
 		clientmiddleware.NewResourceResponseMiddleware(),
-	}
+	)
 
 	// Placing the new service implementation behind a feature flag until it is known to be stable
 	if features.IsEnabled(featuremgmt.FlagUseCachingService) {
@@ -181,5 +189,11 @@ func CreateMiddlewares(cfg *setting.Cfg, oAuthTokenService oauthtoken.OAuthToken
 
 	middlewares = append(middlewares, clientmiddleware.NewHTTPClientMiddleware())
 
+	if features.IsEnabled(featuremgmt.FlagPluginsInstrumentationStatusSource) {
+		// StatusSourceMiddleware should be at the very bottom, or any middlewares below it won't see the
+		// correct status source in their context.Context
+		middlewares = append(middlewares, clientmiddleware.NewStatusSourceMiddleware())
+	}
+
 	return middlewares
 }