| 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. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/openzipkin/zipkin-go/idgenerator | Package idgenerator contains several Span and Trace ID generators which can be used by the Zipkin tracer. |
| github.com/openzipkin/zipkin-go/model | Package model contains the Zipkin V2 model which is used by the Zipkin Go tracer implementation. |
| github.com/openzipkin/zipkin-go/propagation | Package propagation holds the required function signatures for Injection and Extraction as used by the Zipkin Tracer. |
| github.com/openzipkin/zipkin-go/reporter | Package reporter holds the Reporter interface which is used by the Zipkin Tracer to send finished spans. |
| math | Package math provides basic constants and mathematical functions. |
| math/rand | Package rand implements pseudo-random number generators suitable for tasks such as simulation, but it should not be used for security-sensitive work. |
| net | Package net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| sync/atomic | Package atomic provides low-level atomic memory primitives useful for implementing synchronization algorithms. |
| time | Package time provides functionality for measuring and displaying time. |