Cloud endpoint management leaking memory?

[cputoaster]

I have a strange problem with GAE Java. There are two instances with basic scaling for the version I am using, with one being used and the other idling, from what I can see in the log. Response times are fine. I can see that my idle instance did not receive any requests for the last hour. Strangely, on the idle instance the memory usage goes up constantly at around a 2MB/minute. For the last hour.

In production (total of both instances) this leads to a sawtooth type memory usage graph, where instances get killed regularely.

Commenting out the management parts of the config seems to stop the leaking. This is using the most recent official SDK / maven packages as of about 2m ago.

(more detailed see: https://stackoverflow.com/questions/48439225/cloud-endpoint-management-leaking-memory?noredirect=1#comment84051645_48439225)