I upgraded my RDS postgres instances from 9.3 -> 9.4 -> 9.5 several months ago. When installing the pganalyzer-collector tool, I got a funny error that the "queryid" column does not exist in the pg_stat_statements table. It looks like that column was added in version 9.4. I'm now running 9.5 and expect to see this column in that table.
How could this have happened? And how can I make this column appear in the pg_stat_statements table?