What if zipkin UI's search default was 15 minutes, not an hour

[Adrian Cole]

Hi, all.

We are looking at some storage optimizations relating to query
performance. There are some things that relate directly the the
default amount of data searched when the zipkin UI (now called lens)
is used.

I've attached an image to clarify the knob talking about.

Anyway, right now, the default is 1hr. So when someone opens zipkin
and does nothing but click search, it looks at an hour of data to find
10 trace IDs. For things like duration query, this can take longer
than if it were 15 minutes.

If you have feedback, please add it to the following issue!

https://github.com/openzipkin/zipkin/issues/2772