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backoff.go
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backoff.go
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// Copyright (C) 2019-2023 vdaas.org vald team <vald@vdaas.org>
//
// 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
//
// https://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 backoff
import (
"context"
"github.com/vdaas/vald/internal/backoff"
"github.com/vdaas/vald/internal/observability/attribute"
"github.com/vdaas/vald/internal/observability/metrics"
"go.opentelemetry.io/otel/sdk/metric/aggregation"
"go.opentelemetry.io/otel/sdk/metric/view"
)
const (
metricsName = "backoff_retry_count"
metricsDescription = "Backoff retry count"
)
type backoffMetrics struct {
backoffNameKey string
}
func New() metrics.Metric {
return &backoffMetrics{
backoffNameKey: "backoff_name",
}
}
func (*backoffMetrics) View() ([]*metrics.View, error) {
retryCount, err := view.New(
view.MatchInstrumentName(metricsName),
view.WithSetDescription(metricsDescription),
view.WithSetAggregation(aggregation.LastValue{}),
)
if err != nil {
return nil, err
}
return []*metrics.View{
&retryCount,
}, nil
}
func (bm *backoffMetrics) Register(m metrics.Meter) error {
retryCount, err := m.AsyncInt64().Gauge(
metricsName,
metrics.WithDescription(metricsDescription),
metrics.WithUnit(metrics.Dimensionless),
)
if err != nil {
return err
}
return m.RegisterCallback(
[]metrics.AsynchronousInstrument{
retryCount,
},
func(ctx context.Context) {
ms := backoff.Metrics(ctx)
if len(ms) == 0 {
return
}
for name, cnt := range ms {
retryCount.Observe(ctx, cnt, attribute.String(bm.backoffNameKey, name))
}
},
)
}