How to monitor Google App Engine Queue size over time?

[Slipstream via StackOverflow]

Thanks to @tx802 for help with this answer:

It's not currently simple to view these metrics. The process to setting them up however is:

1. Set up a simple CRON job to read the QueueStatistics object for the given queue on whatever time basis is interesting (I chose every 5 minutes).
2. Use the Custom Metrics function to store the value as a custom metric which you can then pull up in the Cloud Monitoring Dashboard.

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