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Removes the functionality of the Describe in prometheus exporter. #3342

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merged 3 commits into from Oct 18, 2022
Merged

Removes the functionality of the Describe in prometheus exporter. #3342

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f386315
remove prom exporter Describe
MadVikingGod Oct 17, 2022
377e50a
Apply suggestions from code review
MadVikingGod Oct 18, 2022
d58eb16
Merge branch 'main' into mvg/prom-describe
MrAlias Oct 18, 2022
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2 changes: 2 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -16,6 +16,8 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm

- `sdktrace.TraceProvider.Shutdown` and `sdktrace.TraceProvider.ForceFlush` to not return error when no processor register. (#3268)
- The `"go.opentelemetry.io/otel/exporters/prometheus".New` now also returns an error indicating the failure to register the exporter with Prometheus. (#3239)
- The prometheus exporter will no longer try to enumerate the metrics it will send to prometheus on startup.
This fixes the `reader is not registered` warning currently emitted on startup. (#3291 #3342)

### Fixed

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12 changes: 5 additions & 7 deletions exporters/prometheus/exporter.go
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Expand Up @@ -69,13 +69,11 @@ func New(opts ...Option) (*Exporter, error) {

// Describe implements prometheus.Collector.
func (c *collector) Describe(ch chan<- *prometheus.Desc) {
metrics, err := c.reader.Collect(context.TODO())
if err != nil {
otel.Handle(err)
}
for _, metricData := range getMetricData(metrics) {
ch <- metricData.description
}
// The Opentelemetry SDK doesn't have information on which will exist when the collector
// is registered. By returning nothing we are an "unchecked" collector in Prometheus,
// and assume responsibility for consistency of the metrics produced.
//
// See https://pkg.go.dev/github.com/prometheus/client_golang@v1.13.0/prometheus#hdr-Custom_Collectors_and_constant_Metrics
}

// Collect implements prometheus.Collector.
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