Don't track logged-in users, but allow an opt-out.

eth-amp-analytics-wp.php

@@ -113,6 +113,11 @@ class ETH_AMP_Analytics_WP {
 			$analytics = array();
 		}
 
+		// Don't track logged-in/known users visits
+		if ( is_user_logged_in() && apply_filters( 'eth_amp_do_not_track_known_user', is_user_logged_in() ) ) {
+			return $analytics;
+		}
+
 		$analytics['eth-amp-googleanalytics'] = array(
 			'type' => 'googleanalytics',
 			'attributes' => array(