| bufio | Package bufio implements buffered I/O. It wraps an io.Reader or io.Writer object, creating another object (Reader or Writer) that also implements the interface but provides buffering and some help for textual I/O. |
| 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. |
| go.opencensus.io/plugin/ochttp/propagation/b3 | Package b3 contains a propagation.HTTPFormat implementation for B3 propagation. |
| go.opencensus.io/stats | Package stats contains support for OpenCensus stats recording. |
| go.opencensus.io/stats/view | Package view contains support for collecting and exposing aggregates over stats. |
| go.opencensus.io/tag | Package tag contains OpenCensus tags. |
| go.opencensus.io/trace | Package trace contains support for OpenCensus distributed tracing. |
| go.opencensus.io/trace/propagation | Package propagation implements the binary trace context format. |
| io | Package io provides basic interfaces to I/O primitives. |
| net | Package net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets. |
| net/http | Package http provides HTTP client and server implementations. |
| net/url | Package url parses URLs and implements query escaping. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| time | Package time provides functionality for measuring and displaying time. |