Risk of incompatibilities between on-prem versions?

We will be upgrading our on-prem Apigee from 4.18.05 to 4.19.01. The users, API proxy developers, of our shared, on-prem setup are worried about incompatibilities that might popup..

Questions:

- How to efficiently test correct working and backward compatibility immediately after our upgrade? Is there a generic test set that leverages different policies and Javascript snippets to validate the good working of the platform?

- Is there any formal policy by Google/Apigee regarding the compatibility across versions? Will (almost) all compatibility issues have already been detected by users of the cloud version? It is unclear how far the on-prem version and code base deviates from the cloud version.

Welcoming your feedback!

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