Hi Developers,

Reviewing the Created timestamps for Summary metrics, I'm not sure anymore 
if we do it right in client_java:

In the current implementation of Summary we have:

   - Count: Total number since application start.
   - Sum: Total number since application start.
   - Quantiles: Sliding time window, by default rotated every 10 minutes.

The Created timestamp is constant and refers to the application startup.

That means, the Created timestamp is correct for Count and Sum, but 
incorrect for the Quantiles, as the Quantiles are max 10 minutes old.

I'm wondering: Is this how the Created timestamp for Summary metrics is 
supposed to be implemented?

Fabian 

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