Hi,
Within my APEX app I have a page (https://cc13.xyz) with a few card/chart regions. Sometimes it happens when I load the page the on the right top corner an error message appears and shows "Error: Service Unavailable". In this case minimum one of this charts is not loaded. Instead it shows "No data to display" in the chart region. It's not always the case and not always the same chart.
Each chart get the data from a select on his own table in the database. This tables are filled with a sync job in the rest data source from different rest end points. The tables are always filled with data and the sync jobs are running fine.
I use the always free database. In the included compute a nginx server is installed to resolve the domain and route to the always free installed ORDS/APEX.
Thanks,
CC13