Merge pull request #542 from highcharts/cleanup/moving-avg-message

cleanup/moving-avg-message

Author: PaulDalek

lib/server/routes/health.js

@@ -100,7 +100,10 @@ export default function addHealthRoutes(app) {
       // Moving average
       period,
       movingAverage,
-      message: `Last ${period} minutes had a success rate of ${movingAverage.toFixed(2)}%.`,
+      message:
+        isNaN(movingAverage) || !successRates.length
+          ? 'Too early to report. No exports made yet. Please check back soon.'
+          : `Last ${period} minutes had a success rate of ${movingAverage.toFixed(2)}%.`,
 
       // SVG/JSON attempts
       svgExportAttempts: stats.exportFromSvgAttempts,