| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| go.opencensus.io/examples/exporter | Package exporter contains a log exporter that supports exporting OpenCensus metrics and spans to a logging framework. |
| go.opencensus.io/plugin/ochttp | Package ochttp provides OpenCensus instrumentation for net/http package. |
| go.opencensus.io/stats/view | Package view contains support for collecting and exposing aggregates over stats. |
| go.opencensus.io/trace | Package trace contains support for OpenCensus distributed tracing. |
| go.opencensus.io/zpages | Package zpages implements a collection of HTML pages that display RPC stats and trace data, and also functions to write that same data in plain text to an io.Writer. |
| log | Package log implements a simple logging package. |
| net/http | Package http provides HTTP client and server implementations. |
| time | Package time provides functionality for measuring and displaying time. |