1. Identify the source of the PostgreSQL 2202E error:The PostgreSQL 2202E error is a “could not connect to server” error, which indicates that the connection to the PostgreSQL server has failed. To identify the source of the error, we can use the following code snippet to check the server logs:

SELECT * FROM pg_log WHERE message LIKE '%2202E%';

2. Check the PostgreSQL configuration:Once the source of the error has been identified, we can check the PostgreSQL configuration to ensure that the server is configured correctly. We can use the following code snippet to check the configuration:

`SELECT name, setting FROM pg_settings WHERE name IN ('listen_addresses', 'port');

3. Check the network connection:If the configuration is correct, we can check the network connection to ensure that the server is accessible from the client. We can use the following code snippet to check the network connection:

ping

4. Restart the PostgreSQL server:If the network connection is working, we can restart the PostgreSQL server to ensure that the server is running correctly. We can use the following code snippet to restart the server:

sudo service postgresql restart

5. Use an automated database observability tool: Finally, we can use an automated database observability tool to monitor and fix the PostgreSQL 2202E in question. An automated database observability tool can provide real-time insights into the performance and health of the database, allowing us to quickly identify and fix any issues that may arise. Additionally, the tool can provide alerts when certain thresholds are exceeded, allowing us to take proactive measures to prevent any future issues.