| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/golang/glog | Package glog implements logging analogous to the Google-internal C++ INFO/ERROR/V setup. |
| github.com/google/trillian/util/election2 | Package election2 provides master election tools, and interfaces for plugging in a custom underlying mechanism. |
| go.etcd.io/etcd/client/v3 | Package clientv3 implements the official Go etcd client for v3. |
| go.etcd.io/etcd/client/v3/concurrency | Package concurrency implements concurrency operations on top of etcd such as distributed locks, barriers, and elections. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |