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Salesforce caused a full customer outage mid last week with no warning
I just had Salesforce rudely stomp my app (listed on the AppExchange) last Wednesday (July 6th) because Salesforce added a new Javascript function named Scheduler in their Visualforce Page Javascript. This Javascript function overwrote my object with the same name which caused a service interruption for every single one of our customers. Is it Salesforce's policy to change the Javascript API mid release cycle? Is it possible to get a heads up when the Javascript environment is expected to change on the Visualforce Page platform?
You can find the know issues here: https://success.salesforce.com/issues_index . On the Known issues page, you will find the status of the issues. You can report a problem as well .
> it is hard to believe that salesforce releases something without prior notice
Yes, this is very hard to believe but here is the response from customer care:
We have received confirmation from tier3 that we had introduced a function named "Scheduler" into the main.js file.
Also they have suggested that Customers should be namespacing (well, pseudo-namespacing) their JavaScript code to avoid collisions like this. That's just standard web development method.
Salesforce libraries are growing faster and we cannot possibly document every global variable/function that we're adding to the JavaScript that is served with Salesforce.
So we would suggest you should review your code, and correctly namespace functions/variables so you don't run into this in near future.