Send email notification upon "Migrate Traffic" event?

[Sky Diver]

Is there any way to trigger an email notification event once traffic is migrated to a different version?

[Adam (Cloud Platform Support)]

This feature doesn't exist currently, however you could do something like set up a shell script that wraps gcloud app services set-traffic to do the traffic migration and also send an email using the UNIX mail command. As a trivial example:

#!/usr/bin/env sh

gcloud app services set-traffic ${2} --splits ${1}=1 --migrate
cat "Traffic migrated to version ${1}." | mail -s "Traffic migration alert" someemail@somedomain.com

This could be saved as migrate-traffic.sh and invoked as ./migrate-traffic.sh my-version or ./migrate-traffic.sh my-version my-service. 

[Adam (Cloud Platform Support)]

If you'd like to see this feature implemented, you can also submit a request on the Google Cloud Platform issue tracker.