Vault uses the `go-metrics` package to export telemetry and supports the
following aggregation agents for time-series monitoring:

Config prefix | Name                                                             | Company
------------- | ---------------------------------------------------------------- | -------
`circonus`    | [Circonus](https://www.circonus.com)                             | Circonus
`dogstatsd`   | [DogStatsD](https://docs.datadoghq.com/developers/dogstatsd)     | Datadog
`prometheus`  | [Prometheus](https://prometheus.io)                              | Prometheus / Open source
`stackdriver` | [Cloud Operations](https://cloud.google.com/products/operations) | Google
`statsd`      | [Statsd](https://github.com/statsd/statsd/wiki)                  | Open source
`statsite`    | [Statsite](https://github.com/statsite/statsite)                 | Open source
