Perform the following in the Azure Console:

1. Login to Azure Portal using https://portal.azure.com
2. Go to Azure Database for PostgreSQL server
3. For each database, click on Server parameters
4. Search for log_duration.
5. Click ON and save.

Perform the following in Azure Command Line Interface 2.0:

Use the below command to update log_duration configuration.

az postgres server configuration set –resource-group <resourceGroupName> –server-name <serverName> –name log_duration –value on

References:

1. https://docs.microsoft.com/en-us/rest/api/postgresql/configurations/listbyserver