Expose way to configure RollingSummary

[rukai]

RollingSummary was internally introduced here #306
But there is currently no way for the user to configure how long data is held onto for high level users of metrics/metrics-exporter-prometheus

[tobz]

Yeah, this is a reasonable request. I would accept a PR adding methods to the builder that allow configuring the bucket width and count.

[lilyball]

It looks like this was already done in #444

[tobz]

Yep, just awaiting a release of metrics-exporter-prometheus, which should hopefully be doable somewhere between today and the next seven days. I've been queueing up a lot of changes to bundle together.

[tobz]

Released in metrics-exporter-prometheus@v0.14.0.