Heap fragmentation on webserver

ampel-firmware/web_server.cpp

@@ -133,6 +133,7 @@ namespace web_server {
             "<tr><td>MAC</td><td>%s</td></tr>\n"
             "<tr><td>Free heap space</td><td>%6d bytes</td></tr>\n"
             "<tr><td>Largest heap block</td><td>%6d bytes</td></tr>\n"
+            "<tr><td>Frag</td><td>%3d%%</td></tr>\n"
             "<tr><td>Max loop duration</td><td>%5d ms</td></tr>\n"
             "<tr><td>Board</td><td>%s</td></tr>\n"
             "<tr><td>Ampel firmware</td><td>%s</td></tr>\n"
@@ -256,7 +257,7 @@ namespace web_server {
         config::lorawan_sending_interval,
 #endif
         config::temperature_offset, config::auto_calibrate_sensor ? "Yes" : "No", ampel.sensorId, ampel.sensorId,
-        wifi::local_ip, wifi::local_ip, ampel.macAddress, ESP.getFreeHeap(), esp_get_max_free_block_size(),
+        wifi::local_ip, wifi::local_ip, ampel.macAddress, ESP.getFreeHeap(), esp_get_max_free_block_size(), esp_get_heap_fragmentation(),
         ampel.max_loop_duration, ampel.board, ampel.version, dd, hh, mm, ss);
 
     //    Serial.print(F(" - Body size : "));