New in 2.1-beta5: Prometheus monitoring

[Andrew Wilkins]

Hi folks,

In the release notes there was an innocuous line about introspection
endpoints added to the controller. What this really means is that you can
now monitor Juju controllers with Prometheus. Juju controllers export
metrics, including:
 - API requests (total number and latencies by facade/method, grouped by
error code)
 - numbers of entities (models, users, machines, ...)
 - mgo/txn op counts

We're working on getting the online docs updated. In the mean time, please
refer to https://github.com/juju/docs/issues/1624 for instructions on how
to set up Prometheus to scrape Juju. It would be great to get some early
feedback.

Cheers,
Andrew
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