Log available memory upon receiving memory warning.

[selanthiraiyan]

Closes: #12606

Description

To debug Sentry WatchDogTermination issues, we are going to add a log message upon receiving a memory warning.

Internal - peaMlT-zd-p2#comment-1388

Testing instructions

• Launch the app in simulator
• Tap Debug -> Simulate Memory Warning
• Check Xcode logs and validate that you see the following log message

  Received memory warning: Available memory - 0

Screenshots

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• [x] I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce iOS by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS
	Build Number	pr12607-c93d04d
	Version	18.4
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	c93d04d556764d340bcc6b7f0f8bccd2228f3dfc
	App Center Build	WooCommerce - Prototype Builds #8891

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[selanthiraiyan]

Thanks for the review, @toupper!

One question, DDLogDebug logs are sent to Sentry, right? Where in the code is that happening? I am curious about that logic, but I couldn't find it :)

The log file will be uploaded to this WPCOM endpoint by the Automattic-Tracks-iOS library. Code

To find the relevant log file,

• We can find the encrypted log file ID from the Sentry event's "Additional Data" section.
• Download the log file from A8C servers.

If the downloaded log file has the log message "Received memory warning:" we will know that a particular Sentry event had memory issues.

[toupper]

Awesome, thanks a lot for the thorough explanation @selanthiraiyan !