Let to the caller to choose how to handle the call to a method

lib/api/middlewares/pubsub-metrics.js

@@ -3,7 +3,7 @@
 const EVENT_VERSION = '1';
 const MAX_LENGTH = 100;
 
-function pubSubMetrics ({ enabled, metricsBackend }) {
+function pubSubMetrics ({ enabled, metricsBackend, logger }) {
     if (!enabled) {
         return function pubSubMetricsDisabledMiddleware (req, res, next) {
             next();
@@ -15,7 +15,9 @@ function pubSubMetrics ({ enabled, metricsBackend }) {
             const { event, attributes } = getEventData(req, res);
 
             if (event) {
-                metricsBackend.send(event, attributes);
+                metricsBackend.send(event, attributes)
+                    .then(() => logger.debug(`PubSubTracker: event '${event}' published succesfully`))
+                    .catch((error) => logger.error(`ERROR: pubsub middleware failed to publish event '${event}': ${error.message}`));
             }
         });