Adlist was inaccessible during last gravity run

Not quite. :wink:
It would be more accurate to say that Gravity has always been updated regularly without prominently notifying you about failed download attempts.

However, that information has always been logged to pihole_updateGravity.log and also has been available via its Adlists UI, but you'd had to actively look for any irregularities yourself.

That has changed with recent: