Why am I suddenly getting this: API Request Failed

Please explain what this means and why I started getting this at the bottom of my overview page this afternoon (6/5/23

API Request Failed: GET /api/v4/zones/1efb7affd1e81ffef2ccb59859fc856a/analytics/unreachability?limit=1&since=2023-06-05T16:14:08Z (503)

sonsofafrika

Perhaps because of