Hello Justin, 

How did you update your cron configuration? One can redeploy the whole 
application, or only the cron configuration, for Java, with: 

   ./appengine-java-sdk/bin/appcfg.sh -A your-app-id -V app-version 
update_cron [YOUR_APP_DIR]

For details and other languages, you may read the "Scheduling Tasks With 
Cron for Java" documentation page 
<https://cloud.google.com/appengine/docs/standard/java/config/cron?hl=en_GB&_ga=2.10290229.-1824116711.1512502827>
. 

Usually, any change to the cron messages requires that you re-deploy the 
App Engine application. To avoid this, you could rewrite the App Engine 
application to pull the YAML file from a Cloud Storage bucket, have it 
monitor the file for changes, and update App Engine Cron Service when it 
detects modifications to the YAML file. More details are available on the 
"Reliable Task Scheduling on Google Compute Engine" page 
<https://cloud.google.com/solutions/reliable-task-scheduling-compute-engine#next-steps>
. 

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