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metrics.go
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metrics.go
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//
// Copyright 2024 Stacklok, Inc.
//
// 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 events
import (
"fmt"
"time"
"github.com/ThreeDotsLabs/watermill/message"
"github.com/ThreeDotsLabs/watermill/message/router/middleware"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/metric"
)
func recordMetrics(instruments *messageInstruments) func(h message.HandlerFunc) message.HandlerFunc {
metricsFunc := func(h message.HandlerFunc) message.HandlerFunc {
return func(msg *message.Message) ([]*message.Message, error) {
var processingTime time.Duration
if publishedAt := msg.Metadata.Get(PublishedKey); publishedAt != "" {
if parsedTime, err := time.Parse(time.RFC3339, publishedAt); err == nil {
processingTime = time.Since(parsedTime)
}
}
res, err := h(msg)
// Defer the DLQ tracking logic to after the message has been processed by other middlewares,
// including the deferred PoisonQueue middleware functionality,
// so that we can check if it has been poisoned or not.
isPoisoned := msg.Metadata.Get(middleware.ReasonForPoisonedKey) != ""
instruments.messageProcessingTimeHistogram.Record(
msg.Context(),
processingTime.Milliseconds(),
metric.WithAttributes(attribute.Bool("poison", isPoisoned)),
)
return res, err
}
}
return metricsFunc
}
func initMetricsInstruments(meter metric.Meter) (*messageInstruments, error) {
histogram, err := createProcessingLatencyHistogram(meter)
if err != nil {
return nil, err
}
return &messageInstruments{
messageProcessingTimeHistogram: histogram,
}, nil
}
func createProcessingLatencyHistogram(meter metric.Meter) (metric.Int64Histogram, error) {
processingLatencyHistogram, err := meter.Int64Histogram("messages.processing_delay",
metric.WithDescription("Duration between a message being enqueued and dequeued for processing"),
metric.WithUnit("ms"),
// Pick a set of bucket boundaries that span out to 10 minutes
metric.WithExplicitBucketBoundaries(0, 500, 1000, 2000, 5000, 10000, 30000, 60000, 120000, 300000, 600000),
)
if err != nil {
return nil, fmt.Errorf("failed to create message processing processingLatencyHistogram: %w", err)
}
return processingLatencyHistogram, nil
}