I see errors in the logs that appear to be a misplaced comma in the query used by cloudsqladmin
the query
reads SELECT wait_event current_timestamp, count(*) as num_queries, FROM pg_catalog.pg_stat_activity WHERE wait_event_type='IO' GROUP BY wait_event_type, wait_event
its should read
SELECT wait_event, current_timestamp, count(*) as num_queries FROM pg_catalog.pg_stat_activity WHERE wait_event_type='IO' GROUP BY wait_event_type, wait_event