diff --git a/src/Admin/SiteHealth.php b/src/Admin/SiteHealth.php
index c6af0a52d27..f3aced4ff93 100644
--- a/src/Admin/SiteHealth.php
+++ b/src/Admin/SiteHealth.php
@@ -354,6 +354,11 @@ public function add_debug_information( $debugging_information ) {
 							'value'   => MonitorCssTransientCaching::query_css_transient_count(),
 							'private' => false,
 						],
+						'amp_css_transient_caching_time_series' => [
+							'label'   => esc_html__( 'Calculated time series for monitoring the stylesheet caching', 'amp' ),
+							'value'   => MonitorCssTransientCaching::get_time_series(),
+							'private' => false,
+						],
 					],
 				],
 			]
diff --git a/src/BackgroundTask/MonitorCssTransientCaching.php b/src/BackgroundTask/MonitorCssTransientCaching.php
index bb2e46ffea4..65473ce71a0 100644
--- a/src/BackgroundTask/MonitorCssTransientCaching.php
+++ b/src/BackgroundTask/MonitorCssTransientCaching.php
@@ -109,7 +109,7 @@ public function process( DateTimeInterface $date = null, $transient_count = null
 		}
 
 		$date_string = $date->format( 'Ymd' );
-		$time_series = $this->get_time_series();
+		$time_series = self::get_time_series();
 
 		$time_series[ $date_string ] = $transient_count;
 		ksort( $time_series );
@@ -172,7 +172,7 @@ public function handle_plugin_update( $old_version ) {
 	 *
 	 * @return int[] Time series with the count of transients per day.
 	 */
-	private function get_time_series() {
+	public static function get_time_series() {
 		return (array) get_option( self::TIME_SERIES_OPTION_KEY, [] );
 	}