The PoWA-archivist collects data from various stats extensions. To be used in PoWA, a stat extensions has to expose a number of PL/pgSQL functions as stated in Integrating another stat extension in Powa.
Currently, the list of supported stat extensions is as follows:
All those extensions have to be installed on the dedicated powa database of the monitored server.
pg_track_settings has to be also be installed on the dedicated repository server if Remote setup configuration is used.