| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| errors | Package errors implements functions to manipulate errors. |
| github.com/go-kit/kit/endpoint | Package endpoint defines an abstraction for RPCs. |
| github.com/juju/ratelimit | Package ratelimit provides an efficient token bucket implementation that can be used to limit the rate of arbitrary things. |
| time | Package time provides functionality for measuring and displaying time. |