diff options
Diffstat (limited to 'vendor/go.opencensus.io/trace/doc.go')
| -rw-r--r-- | vendor/go.opencensus.io/trace/doc.go | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/vendor/go.opencensus.io/trace/doc.go b/vendor/go.opencensus.io/trace/doc.go index 04b1ee4f3..7a1616a55 100644 --- a/vendor/go.opencensus.io/trace/doc.go +++ b/vendor/go.opencensus.io/trace/doc.go @@ -18,24 +18,23 @@ Package trace contains support for OpenCensus distributed tracing. The following assumes a basic familiarity with OpenCensus concepts. See http://opencensus.io - -Exporting Traces +# Exporting Traces To export collected tracing data, register at least one exporter. You can use one of the provided exporters or write your own. - trace.RegisterExporter(exporter) + trace.RegisterExporter(exporter) By default, traces will be sampled relatively rarely. To change the sampling frequency for your entire program, call ApplyConfig. Use a ProbabilitySampler to sample a subset of traces, or use AlwaysSample to collect a trace on every run: - trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()}) + trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()}) Be careful about using trace.AlwaysSample in a production application with significant traffic: a new trace will be started and exported for every request. -Adding Spans to a Trace +# Adding Spans to a Trace A trace consists of a tree of spans. In Go, the current span is carried in a context.Context. @@ -44,8 +43,8 @@ It is common to want to capture all the activity of a function call in a span. F this to work, the function must take a context.Context as a parameter. Add these two lines to the top of the function: - ctx, span := trace.StartSpan(ctx, "example.com/Run") - defer span.End() + ctx, span := trace.StartSpan(ctx, "example.com/Run") + defer span.End() StartSpan will create a new top-level span if the context doesn't contain another span, otherwise it will create a child span. |