| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/go-kit/kit/log | Package log provides a structured logger. |
| github.com/go-kit/kit/metrics | Package metrics provides a framework for application instrumentation. |
| github.com/go-kit/kit/metrics/generic | Package generic implements generic versions of each of the metric types. |
| github.com/go-kit/kit/util/conn | Package conn provides utilities related to connections. |
| io | Package io provides basic interfaces to I/O primitives. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| time | Package time provides functionality for measuring and displaying time. |