1. Check the PostgreSQL log files for any errors related to the 22022 error code. This can be done by running the following command:

tail -f /var/log/postgresql/postgresql-9.6-main.log

2. Check the PostgreSQL configuration files for any misconfigurations that could be causing the 22022 error. This can be done by running the following command:

cat /etc/postgresql/9.6/main/postgresql.conf

3. Check the PostgreSQL server process for any issues that could be causing the 22022 error. This can be done by running the following command:

ps aux | grep postgres

4. Check the PostgreSQL database for any issues that could be causing the 22022 error. This can be done by running the following command:

psql -U postgres -c

5. If the issue persists, restart the PostgreSQL server process. This can be done by running the following command:

sudo service postgresql restart

6. As a final step, it is recommended to use an automated database observability tool to monitor and fix the PostgreSQL 22022 in question. This tool can provide real-time insights into the performance and health of the database, allowing for quick and easy troubleshooting of any issues that may arise. Additionally, the tool can be used to set up alerts and notifications for any potential issues, allowing for proactive monitoring and maintenance of the database.