In 29468995040ae21e0e1c14c1bdbb16ccb514caa8 these metrics got removed due to refactoring of how notifications work.
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gauge("hydra.queue.notification.time_avg_ms", $json->{nrNotificationTimeAvgMs});
gauge("hydra.queue.notification.time_ms", $json->{nrNotificationTimeMs});
gauge("hydra.queue.notification.done", $json->{nrNotificationsDone});
gauge("hydra.queue.notification.failed", $json->{nrNotificationsFailed});
gauge("hydra.queue.notification.in_progress", $json->{nrNotificationsInProgress});
gauge("hydra.queue.notification.pending", $json->{nrNotificationsPending});