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opentelemetry-go/sdk/metric/exporter.go
Tyler Yahn ad4d54e0f1
Warn metric Exporters of ResourceMetrics reuse (#3556)
To potentially optimize the collection code path (#3047) ResourceMetrics
sent to the Exporter may be reused in the future. Warn users of this.

Co-authored-by: Chester Cheung <cheung.zhy.csu@gmail.com>
2023-01-03 08:15:07 -08:00

70 lines
2.7 KiB
Go

// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package metric // import "go.opentelemetry.io/otel/sdk/metric"
import (
"context"
"fmt"
"go.opentelemetry.io/otel/sdk/metric/aggregation"
"go.opentelemetry.io/otel/sdk/metric/metricdata"
)
// ErrExporterShutdown is returned if Export or Shutdown are called after an
// Exporter has been Shutdown.
var ErrExporterShutdown = fmt.Errorf("exporter is shutdown")
// Exporter handles the delivery of metric data to external receivers. This is
// the final component in the metric push pipeline.
type Exporter interface {
// Temporality returns the Temporality to use for an instrument kind.
Temporality(InstrumentKind) metricdata.Temporality
// Aggregation returns the Aggregation to use for an instrument kind.
Aggregation(InstrumentKind) aggregation.Aggregation
// Export serializes and transmits metric data to a receiver.
//
// This is called synchronously, there is no concurrency safety
// requirement. Because of this, it is critical that all timeouts and
// cancellations of the passed context be honored.
//
// All retry logic must be contained in this function. The SDK does not
// implement any retry logic. All errors returned by this function are
// considered unrecoverable and will be reported to a configured error
// Handler.
//
// The passed ResourceMetrics may be reused when the call completes. If an
// exporter needs to hold this data after it returns, it needs to make a
// copy.
Export(context.Context, metricdata.ResourceMetrics) error
// ForceFlush flushes any metric data held by an exporter.
//
// The deadline or cancellation of the passed context must be honored. An
// appropriate error should be returned in these situations.
ForceFlush(context.Context) error
// Shutdown flushes all metric data held by an exporter and releases any
// held computational resources.
//
// The deadline or cancellation of the passed context must be honored. An
// appropriate error should be returned in these situations.
//
// After Shutdown is called, calls to Export will perform no operation and
// instead will return an error indicating the shutdown state.
Shutdown(context.Context) error
}