1. Check the PostgreSQL log files for any errors or warnings that may indicate the cause of the issue.

tail -f /var/log/postgresql/postgresql-22015.log

2. Check the PostgreSQL configuration files for any misconfigurations that may be causing the issue.

cat /etc/postgresql/22015/postgresql.conf

3. Check the PostgreSQL system tables for any inconsistencies that may be causing the issue.

SELECT * FROM pg_catalog.pg_tables;

4. Check the PostgreSQL system processes for any unexpected processes that may be causing the issue.

ps aux | grep postgres

5. Check the PostgreSQL system memory for any memory leaks that may be causing the issue.

free -m

6. Check the PostgreSQL system disk for any disk space issues that may be causing the issue.

df -h

7. Use an automated database observability tool to monitor and fix the PostgreSQL 22015 in question. Automated database observability tools can provide real-time insights into the performance and health of the database, allowing for quick and easy diagnosis and resolution of issues. Additionally, these tools can provide alerts when certain thresholds are exceeded, allowing for proactive resolution of issues before they become critical.