After a custom function is executed, you can view its execution logs to troubleshoot issues.
Procedure
To view execution logs, first enable the logging feature for the service to which the custom function belongs. You can then view the logs on the function details page.
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Log in to the Function Compute console.
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In the left-side navigation pane, click Services & Functions.
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On the Services page, click the service name.
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On the page that appears, click the name of the function that you want to manage.
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Click the Logs tab.
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On the Logs tab, click Enable.
The logging feature is enabled for the function.