[pgpool-general: 8458] extension pgpool_recovery.control not found

[Jean-Max Reymond]

Hello,
I have installed the pgpool2 package for ubuntu from official repository

echo "deb http://apt.postgresql.org/pub/repos/apt jammy-pgdg main" > 
/etc/apt/sources.list.d/pgdg.list
apt update
apt install postgresql pgpool2

When I want to create the extension, I have the message as follws:
$ psql template1 -c "CREATE EXTENSION pgpool_recovery"
ERROR:  extension "pgpool_recovery" is not available
DETAIL:  Could not open extension control file 
"/usr/share/postgresql/15/extension/pgpool_recovery.control": No such 
file or directory.
HINT:  The extension must first be installed on the system where 
PostgreSQL is running.

And It does not exist on my server.
# locate pgpool_recovery.control
#

Where can I found this extension ?
Thanks for your tips,
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