pg_stat tables empty

Hi,

My statistics collector is not collecting any statistics and functions
such as pg_stat_get_tuples_fetched() return 0.

I have set run-time parameters thusly:

stats_command_string | on
stats_reset_on_server_start | on
stats_row_level | on
stats_start_collector | on

stats processes are running:

postgres ... postgres: stats buffer process
postgres ... postgres: stats collector process

I can't find any suspicious looking messages in syslog or postgres logs.

Any clues where to look next?

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