By default, automatic discovery of instances is enabled. However, you can disable this functionality.
Procedure
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From the navigation pane, go to ** Databases**.
The database Overview page appears.
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Go to the Instances tab.
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In the upper-right corner of the page, click the action icon, and then click Discover instances.
The Discover instances dialog box appears.
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From the Database engine list, select PostgreSQL.
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From the Server name list, select the server to disable auto-discover an instance for.
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Clear the Enable automatic instance discover toggle key.
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Click the Ok.